WITTER DEAN U S GOVERNMENT SECURITIES TRUST
497, 1995-03-01
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<PAGE>
                        DEAN WITTER
                        U.S. GOVERNMENT SECURITIES TRUST
                        PROSPECTUS--FEBRUARY 27, 1995

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DEAN WITTER U.S. GOVERNMENT SECURITIES TRUST (THE "FUND") IS AN OPEN-END
DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT OBJECTIVE IS HIGH
CURRENT INCOME CONSISTENT WITH SAFETY OF PRINCIPAL. THE FUND OFFERS A CONVENIENT
AND ECONOMICAL WAY FOR PERSONS TO INVEST IN A PROFESSIONALLY MANAGED DIVERSIFIED
PORTFOLIO OF OBLIGATIONS ISSUED OR GUARANTEED BY THE U.S. GOVERNMENT OR ITS
INSTRUMENTALITIES. ALL SUCH OBLIGATIONS ARE BACKED BY THE FULL FAITH AND CREDIT
OF THE UNITED STATES. NO ASSURANCE CAN BE GIVEN THAT THE FUND'S OBJECTIVE WILL
BE REALIZED. SHARES OF THE FUND ARE NOT SPONSORED, GUARANTEED, ENDORSED OR
INSURED BY THE U.S. GOVERNMENT OR ANY AGENCY THEREOF.

Shares of the Fund are continuously offered at net asset value. However,
redemptions and/or repurchases are subject in most cases to a contingent
deferred sales charge, scaled down from 5% to 1% of the amount redeemed, if made
within six years of purchase, which charge will be paid to the Fund's
Distributor, Dean Witter Distributors Inc. See "Redemptions and
Repurchases--Contingent Deferred Sales Charge." In addition, the Fund pays the
Distributor a Rule 12b-1 distribution fee pursuant to a Plan of Distribution at
the annual rate of 0.75% (0.65% on amounts over $10 billion) of the lesser of
the (i) average daily aggregate net sales or (ii) average daily net assets of
the Fund. See "Purchase of Fund Shares--Plan of Distribution."

This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated February 27, 1995, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.

   
<TABLE>
<CAPTION>
TABLE OF CONTENTS

<S>                                                 <C>
Prospectus Summary................................       2
Summary of Fund Expenses..........................       3
Financial Highlights..............................       4
The Fund and its Management.......................       5
Investment Objective and Policies.................       5
  Risk Considerations.............................       7
Purchase of Fund Shares...........................       9
Shareholder Services..............................      10
Redemptions and Repurchases.......................      12
Dividends, Distributions and Taxes................      14
Performance Information...........................      14
Additional Information............................      15
</TABLE>
    

SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.

DEAN WITTER
U.S. GOVERNMENT SECURITIES TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550

(800) 526-3143

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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.

                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>             <C>
THE FUND        The Fund is organized as a Trust, commonly known as a Massachusetts business trust, and
                is an open-end diversified management investment company investing in obligations issued
                or guaranteed by the U.S. Government.
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SHARES OFFERED  Shares of beneficial interest with $0.01 par value (see page 15).
- -------------------------------------------------------------------------------------------------------

OFFERING        At net asset value without sales charge (see page 8). Shares redeemed within six years
PRICE           of purchase are subject to a contingent deferred sales charge under most circumstances
                (see pages 12-13).
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MINIMUM         Minimum initial investment, $1,000; minimum subsequent investment, $100 (see page 8).
PURCHASE
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INVESTMENT      The investment objective of the Fund is high current income consistent with safety of
OBJECTIVE       principal.
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INVESTMENT      Dean Witter InterCapital Inc., the Investment Manager of the Fund, and its wholly-owned
MANAGER         subsidiary, Dean Witter Services Company Inc., serve in various investment management,
                advisory, management and administrative capacities to ninety-one investment companies
                and other portfolios with assets of approximately $66.9 billion at December 31, 1994
                (see page 5).
- -------------------------------------------------------------------------------------------------------

MANAGEMENT      The Investment Manager receives a monthly fee at the annual rate of 0.50% ( 1/2 of 1%)
FEE             of daily net assets, scaled down on assets over $1 billion. The fee should not be
                compared with fees paid by other investment companies without also considering
                applicable sales loads and distribution fees, including those noted below (see page 5).
- -------------------------------------------------------------------------------------------------------

DIVIDENDS       Dividends are declared daily, and paid monthly either in additional shares of the Fund
                or, at the shareholder's option, in cash (see page 14).
- -------------------------------------------------------------------------------------------------------

DISTRIBUTOR     Dean Witter Distributors Inc. (the "Distributor"). The Distributor receives from the
AND             Fund a distribution fee accrued daily and payable monthly at the rate of 0.75% per annum
DISTRIBUTION    (0.65% on amounts over $10 billion) of the lesser of (i) the Fund's average daily
FEE             aggregate net sales or (ii) the Fund's average daily net assets. The fee compensates the
                Distributor for the services provided in distributing shares of the Fund and for
                sales-related expenses. The Distributor also receives the proceeds of any contingent
                deferred sales charges (see pages 9-10 and 12-14).
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REDEMPTION--    Shares are redeemable by the shareholder at net asset value. An account may be
CONTINGENT      involuntarily redeemed if the total value of the account is less than $100. Although no
DEFERRED        commission or sales charge is imposed upon the purchase of shares, a contingent deferred
SALES CHARGE    sales charge (scaled down from 5% to 1%) is imposed on any redemption of shares if after
                such redemption the aggregate current value of an account with the Fund falls below the
                aggregate amount of the investor's purchase payments made during the six years preceding
                the redemption. However, there is no charge imposed on redemption of shares purchased
                through reinvestment of dividends or distributions (see pages 12-14).
- -------------------------------------------------------------------------------------------------------

RISKS           The Fund invests only in obligations issued or guaranteed by the U.S. Government which
                are subject to minimal risk of loss of income and principal. It may engage in the
                purchase of such securities on a when-issued basis. The value of the Fund's portfolio
                securities, and therefore the Fund's net asset value per share, may increase or decrease
                due to various factors, principally changes in prevailing interest rates. Generally, a
                rise in interest rates will result in a decrease in the Fund's net asset value per
                share, while a drop in interest rates will result in an increase in the Fund's net asset
                value per share. In addition, the average life of certain of the securities held in the
                Fund's portfolio (i.e., GNMA Certificates) may be shortened by prepayments or
                refinancings of the mortgage pools underlying such securities. Such prepayments may have
                an impact on dividends paid by the Fund (see pages 5-9).
- -------------------------------------------------------------------------------------------------------
</TABLE>
    

  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                                   ELSEWHERE
       IN THIS PROSPECTUS AND IN THE STATEMENT OF ADDITIONAL INFORMATION

2
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------

The  following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are for the fiscal
year ended December 31, 1994.

<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                                         <C>
Maximum Sales Charge Imposed on Purchases.............................          None
Maximum Sales Charge Imposed on Reinvested Dividends..................          None
Deferred Sales Charge
 (as a percentage of the lesser of original purchase price or
 redemption proceeds).................................................          5.0%
</TABLE>

 A contingent deferred sales charge is imposed at the following declining rates:

<TABLE>
<CAPTION>
               YEAR SINCE PURCHASE PAYMENT MADE                    PERCENTAGE
               --------------------------------------------------  -----------
               <S>                                                 <C>
               First.............................................      5.0%
               Second............................................      4.0%
               Third.............................................      3.0%
               Fourth............................................      2.0%
               Fifth.............................................      2.0%
               Sixth.............................................      1.0%
               Seventh and thereafter............................     None
</TABLE>

<TABLE>
<S>                                                                         <C>
Redemption Fees.......................................................          None
Exchange Fee..........................................................          None

ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
Management Fees.......................................................         0.40%
12b-1 Fees*...........................................................         0.75%
Other Expenses........................................................         0.07%
Total Fund Operating Expenses.........................................         1.22%
<FN>
- ------------------------
* A PORTION  OF THE 12B-1  FEE EQUAL TO  0.20% OF THE  FUND'S AVERAGE DAILY  NET
  ASSETS  IS  CHARACTERIZED AS  A  SERVICE FEE  WITHIN  THE MEANING  OF NATIONAL
  ASSOCIATION OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES (SEE "PURCHASE  OF
  FUND SHARES").
</TABLE>

<TABLE>
<CAPTION>
                                                                                    10
EXAMPLE                                             1 YEAR    3 YEARS   5 YEARS    YEARS
- --------------------------------------------------  -------   -------   -------   -------
<S>                                                 <C>       <C>       <C>       <C>
You  would pay the following  expenses on a $1,000
 investment, assuming (1) 5% annual return and (2)
 redemption at the end of each time period........    $62       $69       $87       $148
You would pay the  following expenses on the  same
 investment, assuming no redemption...............    $12       $39       $67       $148
</TABLE>

The  above example should not  be considered a representation  of past or future
expenses or performance. Actual expenses of the Fund may be greater or less than
those shown.

The purpose of this table is to assist the investor in understanding the various
costs and  expenses  that  an  investor  in  the  Fund  will  bear  directly  or
indirectly.  For a  more complete description  of these costs  and expenses, see
"The Fund  and its  Management,"  "Plan of  Distribution" and  "Redemptions  and
Repurchases."

Long-term   shareholders  of  the  Fund  may  pay  more  in  sales  charges  and
distribution fees than the  economic equivalent of  the maximum front-end  sales
charges permitted by the NASD.

                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
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The  following ratios  and per  share data  for a  share of  beneficial interest
outstanding throughout each period  have been audited  by Price Waterhouse  LLP,
independent  accountants. The financial highlights should be read in conjunction
with the financial statements, the notes  thereto and the unqualified report  of
independent  accountants  which are  contained  in the  Statement  of Additional
Information. Further information about the performance of the Fund is  contained
in  the  Fund's Annual  Report to  Shareholders, which  may be  obtained without
charge upon request to the Fund.

<TABLE>
<CAPTION>
                                                             FOR THE YEAR ENDED DECEMBER 31,
                         --------------------------------------------------------------------------------------------------------
                          1994       1993       1992       1991      1990       1989       1988       1987       1986      1985
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
<S>                      <C>       <C>        <C>        <C>        <C>       <C>        <C>        <C>        <C>        <C>
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of
  period...............  $9.31      $9.30      $9.52      $9.37     $9.51      $9.42      $9.75     $10.33     $10.53     $10.47
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
  Net investment
   income..............   0.58       0.64       0.74       0.87      0.90       0.91       0.97       0.96       1.02      1.24
  Net realized and
   unrealized gain
   (loss) on
   investments.........  (0.90)      0.01      (0.22)      0.15     (0.14)      0.09      (0.33)     (0.58)     (0.20)     0.13
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
  Total from investment
   operations..........  (0.32)      0.65       0.52       1.02      0.76       1.00       0.64       0.38       0.82      1.37
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
  Less dividends and
   distributions from:
    Net investment
     income............  (0.58)     (0.64)     (0.74)     (0.87)    (0.90)     (0.91)     (0.97)     (0.96)     (1.02)    (1.24)
    Net realized
     gain..............    -0-        -0-        -0-        -0-       -0-        -0-        -0-        -0-        -0-     (0.07)
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
  Total dividends and
   distributions.......  (0.58)     (0.64)     (0.74)     (0.87)    (0.90)     (0.91)     (0.97)     (0.96)     (1.02)    (1.31)
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
  Net asset value, end
   of period...........  $8.41      $9.31      $9.30      $9.52     $9.37      $9.51      $9.42      $9.75     $10.33     $10.53
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
                         -------   --------   --------   --------   -------   --------   --------   --------   --------   -------
TOTAL INVESTMENT
  RETURN+..............  (3.51)%     7.13%      5.76%     11.43%     8.49%     11.10%      6.74%      3.92%      8.23%    14.00%
RATIOS/SUPPLEMENTAL
  DATA:
  Net assets, end of
   period
   (in millions).......  $8,211    $12,235    $12,484    $11,736    $9,829    $10,167    $10,366    $10,418    $11,100    $7,511
  Ratios to average net
   assets:
    Expenses...........   1.22%      1.18%      1.20%      1.17%     1.23%      1.19%      1.21%      1.18%      1.20%     1.30%
    Net investment
     income............   6.57%      6.78%      7.91%      9.23%     9.60%      9.62%     10.01%      9.63%      9.72%    11.53%
  Portfolio turnover
   rate................     26%        32%        40%       104%       54%        44%        15%        51%        93%       98%
<FN>
- ------------------------------
+ DOES NOT REFLECT THE DEDUCTION OF SALES LOAD.
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

4
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------

Dean Witter  U.S.  Government  Securities  Trust (the  "Fund")  is  an  open-end
diversified  management  investment  company  registered  under  the  Investment
Company Act of 1940,  as amended (the "Act").  The Fund is a  Trust of the  type
commonly  known as a "Massachusetts business  trust" and was organized under the
laws of The Commonwealth of Massachusetts on September 29, 1983.

    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment  Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment  Manager.  The Investment  Manager, which  was incorporated  in July,
1992, is a wholly-owned  subsidiary of Dean Witter,  Discover & Co., a  balanced
financial  services organization providing a  broad range of nationally marketed
credit and investment products.

    InterCapital and its wholly-owned  subsidiary, Dean Witter Services  Company
Inc.,   serve  in  various  investment   management,  advisory,  management  and
administrative capacities to  ninety-one investment companies,  thirty of  which
are  listed  on the  New  York Stock  Exchange,  with combined  total  assets of
approximately $64.9 billion at  December 31, 1994.  The Investment Manager  also
manages  portfolios of pension  plans, other institutions  and individuals which
aggregated approximately $2.0 billion at such date.

    The Fund  has  retained the  Investment  Manager to  provide  administrative
services,  manage its business  affairs and manage the  investment of the Fund's
assets, including the placing of orders  for the purchase and sale of  portfolio
securities.  InterCapital  has retained  Dean  Witter Services  Company  Inc. to
perform the aforementioned administrative services for the Fund.

    The Fund's Trustees  review the various  services provided by  or under  the
direction of the Investment Manager to ensure that the Fund's general investment
policies  and programs  are being properly  carried out  and that administrative
services are being provided to the Fund in a satisfactory manner.

    As full compensation for the services  and facilities furnished to the  Fund
and  expenses of the Fund  assumed by the Investment  Manager, the Fund pays the
Investment Manager monthly compensation  calculated daily at  an annual rate  of
0.50%  of the  daily net assets  of the  Fund up to  $1 billion,  scaled down at
various asset levels to 0.30% on assets over $12.5 billion. For the fiscal  year
ended  December 31, 1994, the Fund  accrued total compensation to the Investment
Manager amounting to 0.40% of the Fund's average daily net assets and the Fund's
total expenses amounted to 1.22% of the Fund's average daily net assets.

INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------

The investment objective  of the  Fund is  high current  income consistent  with
safety  of  principal.  This investment  objective  may not  be  changed without
approval of the Fund's shareholders. The Fund seeks to achieve its objective  by
investing  in obligations  issued or  guaranteed by  the U.S.  Government or its
instrumentalities ("U.S.  Government  securities").  All  such  obligations  are
backed  by the "full faith and credit"  of the United States. Investments may be
made in obligations of instrumentalities of the U.S. Government only where  such
obligations are guaranteed by the U.S. Government.

    U.S.  Government securities  include U.S. Treasury  securities consisting of
Treasury bills,  Treasury notes  and  Treasury bonds.  Some  of the  other  U.S.
Government  securities in  which the Fund  may invest include  securities of the
Federal Housing Administration,  the Government  National Mortgage  Association,
the  Department of  Housing and Urban  Development, the  Export-Import Bank, the
Farmers Home Administration, the  General Services Administration, the  Maritime
Administration,   Resolution   Funding  Corporation   and  the   Small  Business
Administration. The  maturities  of such  securities  usually range  from  three
months to thirty years.

    The  Fund  is  not limited  as  to  the maturities  of  the  U.S. Government
securities in which it may invest, except  that the Fund will not purchase  zero
coupon  securities with  remaining maturities  of longer  than ten  years. For a
discussion of the risks  of investing in  U.S. Government securities  (including
such  securities purchased on a when-issued, delayed delivery or firm commitment
basis and zero coupon securities), see "Risk Considerations" below.

    While the Fund has  the ability to  invest in any  securities backed by  the
full  faith and credit of the United  States, it is currently anticipated that a
substantial portion of the Fund's assets will be invested in Certificates of the
Government National  Mortgage  Association  (GNMA). Should  market  or  economic
conditions  warrant,  this  policy is  subject  to  change at  any  time  at the
discretion of the Investment Manager.
DESCRIPTION  OF  GNMA  CERTIFICATES    GNMA  Certificates  are   mortgage-backed
securities.  Each  Certificate  evidences  an interest  in  a  specific  pool of
mortgages insured  by the  Federal Housing  Administration or  the Farmers  Home
Administration   (FHA)  or  guaranteed  by  the  Veterans  Administration  (VA).
Scheduled payments of principal and interest are made to the registered  holders
of  GNMA Certificates. The GNMA Certificates that the Fund will invest in are of
the modified pass-through type.  GNMA guarantees the  timely payment of  monthly
installments  of principal and interest on modified pass-through certificates at
the  time   such  payments   are  due,   whether  or   not  such   amounts   are

                                                                               5
<PAGE>
collected  by the issuer  on the underlying mortgages.  The National Housing Act
provides that the full faith and credit  of the United States is pledged to  the
timely  payment of principal and  interest by GNMA of  amounts due on these GNMA
Certificates.

    The average life  of GNMA  Certificates varies  with the  maturities of  the
underlying mortgage instruments with maximum maturities of 30 years. The average
life  is  likely to  be substantially  less  than the  original maturity  of the
mortgage pools  underlying  the  securities  as the  result  of  prepayments  or
refinancing  of  such  mortgages  or foreclosure.  Such  prepayments  are passed
through to the registered holder with the regular monthly payments of  principal
and  interest, which has the effect of reducing future payments. Due to the GNMA
guarantee, foreclosures impose no risk  to investment principal. The  occurrence
of  mortgage prepayments is affected by  factors including the level of interest
rates, general economic  conditions, the location  and age of  the mortgage  and
other  social and demographic conditions. As prepayment rates vary widely, it is
not possible  to accurately  predict  the average  life  of a  particular  pool.
However,  statistics indicate  that the  average life  of the  type of mortgages
backing the majority  of GNMA  Certificates is approximately  twelve years.  For
this  reason,  it is  standard practice  to treat  GNMA Certificates  as 30-year
mortgage-backed securities  which prepay  fully in  the twelfth  year. Pools  of
mortgages  with other maturities or  different characteristics will have varying
assumptions for average  life. The assumed  average life of  pools of  mortgages
having  terms of less than 30 years is less than twelve years, but typically not
less than five years.

    The coupon rate of interest of GNMA Certificates is lower than the  interest
rate   paid  on  the  VA-guaranteed  or  FHA-insured  mortgages  underlying  the
Certificates, but only by the amount of the fees paid to GNMA and the issuer.

    Yields on pass-through securities are typically quoted by investment dealers
and vendors  based  on  the  maturity of  the  underlying  instruments  and  the
associated  average life  assumption. In periods  of falling  interest rates the
rate of prepayment tends to increase, thereby shortening the actual average life
of a pool of mortgage-related securities. Conversely, in periods of rising rates
the rate of prepayment tends to decrease, thereby lengthening the actual average
life of the pool. Reinvestment by the Fund of prepayments may occur at higher or
lower interest rates than the original investment. Historically, actual  average
life  has been consistent with the twelve-year assumption referred to above. The
actual yield of each GNMA Certificate is influenced by the prepayment experience
of the mortgage pool underlying the Certificates. Interest on GNMA  Certificates
is paid monthly rather than semi-annually as for traditional bonds.

    The  Fund  will  invest  in  mortgage  pass-through  securities representing
participation interests in  pools of  residential mortgage  loans originated  by
United  States governmental or private lenders such as banks, broker-dealers and
financing  corporations  and  guaranteed,  to   the  extent  provided  in   such
securities,  by  the  United  States  Government  or  one  of  its  agencies  or
instrumentalities.  Such  securities,  which  are  ownership  interests  in  the
underlying  mortgage  loans,  differ from  conventional  debt  securities, which
provide  for   periodic  payment   of  interest   in  fixed   amounts   (usually
semi-annually)  and principal payments  at maturity or  on specified call dates.
Mortgage pass-through  securities  provide  for  monthly  payments  that  are  a
"pass-through"  of the  monthly interest  and principal  payments (including any
prepayments) made by the individual borrowers on the pooled mortgage loans,  net
of  any fees paid  to the guarantor of  such securities and  the servicer of the
underlying mortgage loans.  The guaranteed mortgage  pass-through securities  in
which  the Fund may invest  include those issued or  guaranteed by GNMA or other
entities which securities are backed by the full faith and credit of the  United
States.

    Certificates  for  mortgage-backed  securities  evidence  an  interest  in a
specific pool of  mortgages. These  certificates are, in  most cases,  "modified
pass-through"  instruments, wherein the issuing agency guarantees the payment of
principal and interest on mortgages underlying the certificates, whether or  not
such amounts are collected by the issuer on the underlying mortgages.

ADJUSTABLE  RATE MORTGAGE  SECURITIES.  The  Fund may also  invest in adjustable
rate mortgage securities  ("ARMs"), which are  pass-through mortgage  securities
collateralized  by  mortgages  with  adjustable rather  than  fixed  rates. ARMs
eligible for inclusion in a mortgage pool generally provide for a fixed  initial
mortgage  interest  rate for  either the  first three,  six, twelve  or thirteen
scheduled monthly  payments.  Thereafter,  the interest  rates  are  subject  to
periodic adjustment based on changes to a designated benchmark index.

    ARMs  contain maximum and  minimum rates beyond  which the mortgage interest
rate may not vary over the lifetime  of the security. In addition, certain  ARMs
provide  for additional limitations on the  maximum amount by which the mortgage
interest rate  may  adjust  for any  single  adjustment  period.  Alternatively,
certain  ARMs contain limitations on changes in the required monthly payment. In
the event that a monthly payment is not sufficient to pay the interest  accruing
on  an ARM, any  such excess interest is  added to the  principal balance of the
mortgage loan, which is repaid through  future monthly payments. If the  monthly
payment  for such an instrument  exceeds the sum of  the interest accrued at the
applicable mortgage interest  rate and  the principal payment  required at  such
point  to amortize the outstanding principal  balance over the remaining term of
the loan,  the excess  is  utilized to  reduce  the then  outstanding  principal
balance of the ARM.

COLLATERALIZED MORTGAGE OBLIGATIONS AND MULTICLASS PASS-THROUGH
SECURITIES.   Collateralized mortgage obligations or "CMOs" are debt obligations
collateralized by mortgage loans or mortgage pass-through securities. Typically,

6
<PAGE>
CMOs are collateralized  by GNMA, FNMA  or FHLMC Certificates,  but also may  be
collateralized  by whole loans or private mortgage pass-through securities (such
collateral  collectively  hereinafter   referred  to   as  "Mortgage   Assets").
Multiclass  pass-through securities are equity interests  in a trust composed of
Mortgage Assets. Payments of principal of  and interest on the Mortgage  Assets,
and  any reinvestment income thereon,  provide the funds to  pay debt service on
the  CMOs  or  make  scheduled  distributions  on  the  multiclass  pass-through
securities.  CMOs may be  issued by agencies or  instrumentalities of the United
States government,  or by  private  originators of,  or investors  in,  mortgage
loans,  including  savings  and loan  associations,  mortgage  banks, commercial
banks, investment  banks  and special  purpose  subsidiaries of  the  foregoing.
However,  the Fund will only  invest in CMOs which are  backed by the full faith
and credit of the United States.

    The issuer of  a series of  CMOs may elect  to be treated  as a Real  Estate
Mortgage  Investment  Conduit  ("REMIC").  REMICs  include  governmental  and/or
private entities that issue a fixed pool of mortgages secured by an interest  in
real property. REMICs are similar to CMOs in that they issue multiple classes of
securities,  but  unlike  CMOs, which  are  required  to be  structured  as debt
securities, REMICs  may be  structured as  indirect ownership  interests in  the
underlying assets of the REMICs themselves. However, there are no effects on the
Fund  from investing in CMOs issued by  entities that have elected to be treated
as REMICs, and all  future references to  CMOs shall also  be deemed to  include
REMICs. The Fund may invest without limitation in CMOs.

    In  a CMO, a series of bonds  or certificates is issued in multiple classes.
Each class of CMOs, often  referred to as a "tranche,"  is issued at a  specific
fixed  or floating coupon rate  and has a stated  maturity or final distribution
date. Principal prepayments  on the  Mortgage Assets may  cause the  CMOs to  be
retired substantially earlier than their stated maturities or final distribution
dates.  Interest is  paid or accrues  on all classes  of the CMOs  on a monthly,
quarterly or  semi-annual basis.  Certain  CMOs may  have variable  or  floating
interest  rates and  others may be  stripped (securities which  provide only the
principal or interest feature of the underlying security).

    The principal of and interest on the Mortgage Assets may be allocated  among
the  several classes of a  CMO series in a  number of different ways. Generally,
the purpose of the allocation of the cash  flow of a CMO to the various  classes
is to obtain a more predictable cash flow to the individual tranches than exists
with  the  underlying  collateral  of  the CMO.  As  a  general  rule,  the more
predictable the cash flow is on a  CMO tranche, the lower the anticipated  yield
will  be on that tranche  at the time of  issuance relative to prevailing market
yields on mortgage-backed securities.  As part of the  process of creating  more
predictable  cash flows on most of the tranches in a series of CMOs, one or more
tranches generally must  be created that  absorb most of  the volatility in  the
cash  flows on the underlying  mortgage loans. The yields  on these tranches are
generally higher  than prevailing  market yields  on mortgage-backed  securities
with  similar maturities. As  a result of  the uncertainty of  the cash flows of
these tranches, the market prices of  and yield on these tranches generally  are
more volatile.

    The  Fund also  may invest  in, among  other things,  parallel pay  CMOs and
Planned Amortization Class CMOs ("PAC Bonds"). Parallel pay CMOs are  structured
to  provide payments of principal  on each payment date  to more than one class.
These simultaneous payments  are taken  into account in  calculating the  stated
maturity date or final distribution date of each class, which, as with other CMO
structures,  must be retired  by its stated maturity  date or final distribution
date but  may be  retired earlier.  PAC Bonds  generally require  payments of  a
specified  amount  of  principal on  each  payment  date. PAC  Bonds  always are
parallel pay CMOs with the required principal payment on such securities  having
the highest priority after interest has been paid to all classes.

    For  a discussion of  the risks of  investing in mortgage-backed securities,
see "Risk Considerations" below.

    The purchase or retention of  stripped mortgage-backed securities, CMOs  and
REMICs  investments  will be  made  only in  conformity  with the  provisions of
Section 703.5 of the National Credit Union Administration Rules and Regulations,
as such provisions became effective on December 2, 1991.

RISK CONSIDERATIONS

The net asset  value of the  Fund's shares  will fluctuate with  changes in  the
market value of its portfolio securities. Neither the value nor the yield of the
U.S. Government securities invested in by the Fund (or the value or yield of the
shares  of the Fund) is guaranteed by the U.S. Government. Such values and yield
will fluctuate with changes in prevailing interest rates and other factors.

    Generally, as  prevailing  interest  rates  rise,  the  value  of  the  U.S.
Government  securities held by the Fund, and, concomitantly, the net asset value
of the  Fund's  shares,  will  fall.  Such  securities  with  longer  maturities
generally  tend  to produce  higher  yields and  are  subject to  greater market
fluctuation as a result of changes  in interest rates than debt securities  with
shorter   maturities.  As  noted  above,  except  with  regard  to  zero  coupon
securities, the Fund is not limited as to the maturities of the U.S.  Government
securities in which it may invest.
RISKS  OF MORTGAGE-BACKED  SECURITIES.  Mortgage-backed  securities have certain
different characteristics  than traditional  debt  securities. Among  the  major
differences  are that interest and principal  payments are made more frequently,
usually monthly,  and that  principal may  be prepaid  at any  time because  the
underlying  mortgage loans or other assets generally may be prepaid at any time.
As a result, if

                                                                               7
<PAGE>
the Fund purchases  such a  security at  a premium,  a prepayment  rate that  is
faster than expected may reduce yield to maturity, while a pre-payment rate that
is  slower than  expected may  have the opposite  effect of  increasing yield to
maturity. Alternatively, if the Fund  purchases these securities at a  discount,
faster  than  expected prepayments  will  increase, while  slower  than expected
prepayments may reduce, yield to maturity.

    Mortgage-backed securities,  like  all  fixed-income  securities,  generally
decrease  in value  as a  result of  increases in  interest rates.  In addition,
although generally the value of fixed-income securities increases during periods
of falling  interest rates,  mortgage-backed securities  may benefit  less  than
other  fixed-income securities from declining interest rates because of the risk
of prepayments. As discussed above under "Description of GNMA Certificates," the
assumed average life of mortgages backing  the majority of GNMA Certificates  is
twelve  years. This average life is likely  to be substantially shorter than the
original maturity of the mortgage pools underlying the certificates, as a pool's
duration may be shortened by unscheduled  or early payments of principal on  the
underlying  mortgages. As  prepayment rates vary  widely, it is  not possible to
accurately predict the average life of a particular pool.

    Although the extent of  prepayments on a pool  of mortgage loans depends  on
various  factors,  including the  prevailing  level of  interest  rates, general
economic conditions, the location and age  of the mortgage and other social  and
demographic  conditions, as  a general rule  prepayments on  fixed rate mortgage
loans will  increase during  a period  of falling  interest rates  and  decrease
during  a period of rising interest rates.  If the Fund has purchased securities
backed by pools containing mortgages whose yields exceed the prevailing interest
rate, any premium paid  for such securities  may be lost. As  a result, the  net
asset  value  of  shares of  the  Fund and  the  Fund's ability  to  achieve its
investment objective may be adversely affected by mortgage prepayments.  Amounts
available  for reinvestment by the Fund are likely to be greater during a period
of declining interest rates and, as a  result, likely to be reinvested at  lower
interest rates than during a period of rising interest rates.

    There  are  certain risks  associated specifically  with  CMOs. A  number of
different factors,  including  the extent  of  prepayment of  principal  of  the
Mortgage  Assets, affect the availability of  cash for principal payments by the
CMO issuer on any payment date and, accordingly, affect the timing of  principal
payments on each CMO class.

WHEN-ISSUED  AND DELAYED DELIVERY SECURITIES AND  FORWARD COMMITMENTS  From time
to time, in the ordinary course of business, the Fund may purchase securities on
a when-issued or delayed delivery basis or may purchase or sell securities on  a
forward  commitment basis. When  such transactions are  negotiated, the price is
fixed at the time  of the commitment,  but delivery and  payment can take  place
between  one month and 120 days after the date of the commitment. While the Fund
will only  purchase securities  on a  when-issued, delayed  delivery or  forward
commitment  basis with the  intention of acquiring the  securities, the Fund may
sell the securities before the settlement  date, if it is deemed advisable.  The
securities  so  purchased  or sold  are  subject  to market  fluctuation  and no
interest accrues to the purchaser during this period. At the time the Fund makes
the commitment to purchase or sell securities on a when-issued, delayed delivery
or forward  commitment basis,  it  will record  the transaction  and  thereafter
reflect  the value,  each day,  of such  security purchased  or, if  a sale, the
proceeds to be  received, in determining  its net  asset value. At  the time  of
delivery of the securities, their value may be more or less than the purchase or
sale price. The Fund will also establish a segregated account with its custodian
bank  in which it  will continually maintain  cash or cash  equivalents or other
portfolio securities equal in value to  commitments to purchase securities on  a
when-issued,  delayed delivery or forward commitment  basis. There is no overall
limit on the  percentage of  the Fund's  assets which  may be  committed to  the
purchase  of securities on a when-issued, delayed delivery or forward commitment
basis. An  increase in  the percentage  of the  Fund's assets  committed to  the
purchase  of securities on a when-issued, delayed delivery or forward commitment
basis may increase the volatility of the Fund's net asset value.

ZERO COUPON SECURITIES.  A portion  of the U.S. Government securities  purchased
by  the Fund may be  zero coupon securities with maturity  dates in each case no
later than ten years from the settlement date for the purchase of such security.
Such securities are purchased at a  discount from their face amount, giving  the
purchaser the right to receive their full value at maturity. The interest earned
on  such securities  is, implicitly,  automatically compounded  and paid  out at
maturity. While  such compounding  at a  constant rate  eliminates the  risk  of
receiving  lower  yields upon  reinvestment of  interest if  prevailing interest
rates decline, the owner of a zero coupon security will be unable to participate
in higher  yields  upon reinvestment  of  interest received  on  interest-paying
securities  if  prevailing interest  rates rise.  For  this reason,  zero coupon
securities are  subject  to  substantially  greater  price  fluctuations  during
periods  of changing  prevailing interest  rates than  are comparable securities
which pay interest currently.

    For additional risk disclosure, please  refer to the discussion of  specific
investments above in "Investment Objective and Policies."

PORTFOLIO TRADING

The  Fund  is managed  within InterCapital's  Taxable Fixed-Income  Group, which
manages twenty-four funds and fund portfolios, with approximately $13 billion in
assets at  December  31,  1994.  Rajesh  K.  Gupta,  Senior  Vice  President  of
InterCapital and a member of InterCapital's Taxable Fixed-Income Group, has been
the primary portfolio man-

8

<PAGE>
ager  of the Fund since July, 1992 and has been managing portfolios comprised of
government securities at InterCapital for over five years.

    Although the  Fund  does not  intend  to  engage in  short-term  trading  of
portfolio  securities as a  means of achieving its  investment objective, it may
sell portfolio securities without  regard to the length  of time they have  been
held  whenever such sale will in the Investment Manager's opinion strengthen the
Fund's position  and  contribute  to its  investment  objective.  The  portfolio
trading  engaged  in by  the  Fund may  result  in its  portfolio  turnover rate
exceeding 100%. Brokerage commissions are  not normally charged on the  purchase
or  sale of U.S. Government obligations, but such transactions may involve costs
in the form of spreads between bid and asked prices. Pursuant to an order of the
Securities and Exchange Commission, the  Fund may effect principal  transactions
in  certain money market  instruments with Dean Witter  Reynolds Inc. ("DWR"), a
broker-dealer affiliate  of  InterCapital.  In  addition,  the  Fund  may  incur
brokerage commissions on transactions conducted through DWR.

PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------

The  Fund  offers its  shares  for sale  to the  public  on a  continuous basis.
Pursuant  to  a  Distribution  Agreement  between  the  Fund  and  Dean   Witter
Distributors  Inc. (the "Distributor"), an  affiliate of the Investment Manager,
shares of the Fund  are distributed by  the Distributor and  offered by DWR  and
other  dealers  which  have entered  into  selected dealer  agreements  with the
Distributor ("Selected Broker-Dealers"). The  principal executive office of  the
Distributor is located at Two World Trade Center, New York, New York 10048.

    The minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may  be  made  by  sending  a check,  payable  to  Dean  Witter  U.S. Government
Securities Trust, directly to Dean  Witter Trust Company (the "Transfer  Agent")
at P.O. Box 1040, Jersey City, NJ 07303 or by contacting an account executive of
DWR  or other  Selected Broker-Dealer.  In the  case of  investments pursuant to
Systematic Payroll Deduction Plans (including Individual Retirement Plans),  the
Fund,  in its discretion,  may accept investments without  regard to any minimum
amounts which would  otherwise be required,  if the Fund  has reason to  believe
that  additional investments will increase the  investment in all accounts under
such Plans to  at least $1,000.  Certificates for shares  purchased will not  be
issued unless requested by the shareholder in writing to the Transfer Agent. The
offering  price will be the net asset  value per share next determined following
receipt of an order (see "Determination of Net Asset Value").

    Shares of  the  Fund are  sold  through the  Distributor  on a  normal  five
business  day settlement basis; that  is, payment generally is  due on or before
the fifth business  day (settlement  date) after the  order is  placed with  the
Distributor.  Shares of the Fund purchased  through the Distributor are entitled
to dividends beginning on the next business day following settlement date. Since
DWR and other  Selected Broker-Dealers  forward investors'  funds on  settlement
date,  they will benefit  from the temporary  use of the  funds where payment is
made prior thereto. Shares purchased through the Transfer Agent are entitled  to
dividends  beginning on the next business day  following receipt of an order. As
noted above, orders placed directly with the Transfer Agent must be  accompanied
by payment. Investors will be entitled to receive capital gains distributions if
their  order is received by the close of business on the day prior to the record
date for such distributions. While no sales charge is imposed at the time shares
are purchased, a contingent deferred sales charge may be imposed at the time  of
redemption  (see "Redemptions and Repurchases"). Sales personnel are compensated
for selling shares  of the Fund  at the time  of their sale  by the  Distributor
and/or Selected Broker-Dealer. In addition, some sales personnel of the Selected
Broker-Dealer  will receive  various types  of non-cash  compensation as special
sales incentives,  including trips,  educational  and/or business  seminars  and
merchandise.  The  Fund and  the  Distributor reserve  the  right to  reject any
purchase orders.

PLAN OF DISTRIBUTION

The Fund has adopted a  Plan of Distribution, pursuant  to Rule 12b-1 under  the
Act  (the "Plan"),  under which the  Fund pays  the Distributor a  fee, which is
accrued daily and payable monthly, at an annual rate of 0.75% (0.65% on  amounts
over  $10 billion) of the lesser of: (a) the average daily aggregate gross sales
of  the  Fund's  shares  since  the   inception  of  the  Fund  (not   including
reinvestments  of dividends  or capital  gains distributions),  less the average
daily aggregate net asset value of  the Fund's shares redeemed since the  Fund's
inception  upon which  a contingent  deferred sales  charge has  been imposed or
waived, or (b) the Fund's  average daily net assets. The  fee is treated by  the
Fund  as an  expense in the  year it  is accrued. A  portion of  the fee payable
pursuant to the Plan, equal to 0.20% of the Fund's average daily net assets,  is
characterized  as  a service  fee  within the  meaning  of NASD  guidelines. The
service fee is  a payment made  for personal service  and/or the maintenance  of
shareholder accounts.

    Amounts paid under the Plan are paid to the Distributor to compensate it for
the  services provided and the  expenses borne by the  Distributor and others in
the distribution of the Fund's shares, including the payment of commissions  for
sales  of the Fund's  shares and incentive  compensation to and  expenses of DWR
account executives and

                                                                               9
<PAGE>
others  who  engage  in  or  support  distribution  of  shares  or  who  service
shareholder  accounts, including  overhead and telephone  expenses; printing and
distribution of prospectuses and reports used in connection with the offering of
the Fund's shares to other than current shareholders; and preparation,  printing
and distribution of sales literature and advertising materials. In addition, the
Distributor  may utilize fees  paid pursuant to  the Plan to  compensate DWR and
other Selected  Broker-Dealers for  their opportunity  costs in  advancing  such
amounts,  which compensation would  be in the  form of a  carrying charge on any
unreimbursed distribution expenses.

    For the fiscal year ended December 31, 1994, the Fund accrued payments under
the Plan amounting to $76,161,225, which amount is equal to 0.75% of the  Fund's
average  daily net assets  for the fiscal  year. The payments  accrued under the
Plan were calculated pursuant  to clause (b) of  the compensation formula  under
the Plan.

    At any given time, the expenses of distributing shares of the Fund may be in
excess  of the total of (i)  the payments made by the  Fund pursuant to the Plan
and (ii) the  proceeds of contingent  deferred sales charges  paid by  investors
upon redemption of shares (see "Redemptions and Repurchases--Contingent Deferred
Sales Charge"). For example, if $1 million in expenses in distributing shares of
the  Fund had been incurred  and $750,000 had been  received as described in (i)
and (ii) above, the excess expense would amount to $250,000. The Distributor has
advised the Fund that the  excess distribution expenses, including the  carrying
charge  described above, totalled  $150,832,267 at December  31, 1994, which was
equal to  1.84% of  the Fund's  net assets  on such  date. Because  there is  no
requirement   under  the  Plan  that  the  Distributor  be  reimbursed  for  all
distribution expenses or any requirement that the Plan be continued from year to
year, this excess amount does not  constitute a liability of the Fund.  Although
there  is no legal obligation for the Fund to pay expenses incurred in excess of
payments made to the Distributor under  the Plan and the proceeds of  contingent
deferred  sales charges paid by investors upon  redemption of shares, if for any
reason the Plan is terminated the Trustees will consider at that time the manner
in which to treat such expenses.  Any cumulative expenses incurred, but not  yet
recovered through distribution fees or contingent deferred sales charges, may or
may  not be  recovered through future  distribution fees  or contingent deferred
sales charges.

DETERMINATION OF NET ASSET VALUE

The net asset value per share of the  Fund is determined by taking the value  of
all  the assets of the Fund, subtracting all liabilities, dividing by the number
of shares outstanding  and adjusting  the result to  the nearest  cent. The  net
asset  value per share is calculated by  the Investment Manager at 4:00 P.M. New
York time on each day  that the New York Stock  Exchange is open. The net  asset
value  per share will not be determined on Good Friday and on such other federal
and non-federal holidays as are observed by the New York Stock Exchange.

    In the  calculation  of  the  Fund's net  asset  value:  (1)  all  portfolio
securities  for which  over-the-counter market quotations  are readily available
are valued  at  the  bid price;  (2)  when  market quotations  are  not  readily
available,   including  circumstances  under  which  it  is  determined  by  the
Investment Manager that sale  or bid prices are  not reflective of a  security's
market  value, portfolio securities are valued at their fair value as determined
in good faith under procedures established by and under the general  supervision
of  the  Fund's Board  of  Trustees (valuation  of  securities for  which market
quotations are not readily available may be based upon current market prices  of
securities which are comparable in coupon, rating and maturity or an appropriate
matrix  utilizing  similar factors);  and  (3) short-term  instruments  having a
maturity date of more  than sixty days are  valued on a "mark-to-market"  basis,
that  is, at prices based  on market quotations for  securities of similar type,
yield, quality and maturity, until sixty  days prior to maturity and  thereafter
at  amortized cost. Short-term instruments having  a maturity date of sixty days
or less at the time of purchase are valued at amortized cost unless the Board of
Trustees determines this does not represent fair market value.

    Certain of  the Fund's  portfolio securities  may be  valued by  an  outside
pricing  service approved by the Fund's Trustees. The pricing service utilizes a
matrix system  incorporating  security  quality,  maturity  and  coupon  as  the
evaluation model parameters, and/or research evaluations by its staff, including
review of broker-dealer market price quotations, in determining what it believes
is  the  fair  valuation of  the  portfolio  securities valued  by  such pricing
service.

SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------

AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All dividends and  capital
gains  distributions are automatically paid in full and fractional shares of the
Fund (or, if specified by the shareholder, any other open-end investment company
for which  InterCapital serves  as investment  manager (collectively,  with  the
Fund,  the "Dean Witter  Funds")), unless the shareholder  requests that they be
paid in  cash.  Shares so  acquired  are not  subject  to the  imposition  of  a
contingent  deferred sales  charge upon  their redemption  (see "Redemptions and
Repurchases"). Such dividends and distributions will  be paid, at the net  asset
value  per  share, in  shares of  the Fund  (or  in cash  if the  shareholder so
requests) on the monthly payment date, which generally will be no later than the
last business day of the month for

10
<PAGE>
which the dividend  or distribution  is payable. Processing  of dividend  checks
begins  immediately following  the monthly  payment date.  Shareholders who have
requested to  receive dividends  in  cash will  normally receive  their  monthly
dividend check during the first ten days of the following month.

INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives  a cash payment  representing a dividend  or capital gains distribution
may invest such dividend or distribution at  the net asset value per share  next
determined  after receipt by the  Transfer Agent, by returning  the check or the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so acquired are  not subject to  the imposition of  a contingent deferred  sales
charge upon their redemption (see "Redemptions and Repurchases.")

EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan  which  provides for  any  amount from  $100  to $5,000  to  be transferred
automatically from a checking or savings account, on a semi-monthly, monthly  or
quarterly basis, to the Transfer Agent for investment in shares of the Fund.

SYSTEMATIC  WITHDRAWAL  PLAN.   A  systematic withdrawal  plan  (the "Withdrawal
Plan") is available  for shareholders  who own or  purchase shares  of the  Fund
having  a minimum value of $10,000 based  upon the then current net asset value.
The Withdrawal Plan provides  for monthly or  quarterly (March, June,  September
and  December) checks in any  dollar amount, not less than  $25, or in any whole
percentage of  the  account balance,  on  an annualized  basis.  Any  applicable
contingent  deferred sales charge  will be imposed on  shares redeemed under the
Withdrawal Plan  (See "Redemptions  and Repurchases--Contingent  Deferred  Sales
Charge").  Therefore, any shareholder participating  in the Withdrawal Plan will
have sufficient shares  redeemed from his  or her account  so that the  proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.

    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.

TAX SHELTERED  RETIREMENT PLANS.   Retirement  plans are  available for  use  by
corporations,  the self-employed,  Individual Retirement  Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of  such
plans should be on advice of legal counsel or tax adviser.

    For  further information  regarding plan administration,  custodial fees and
other details, investors should contact their account executive or the  Transfer
Agent.

EXCHANGE  PRIVILEGE.  The Fund makes  available to its shareholders an "Exchange
Privilege" allowing the exchange of shares of the Fund for shares of other  Dean
Witter  Funds sold with  a contingent deferred sales  charge ("CDSC funds"), and
for shares of Dean  Witter Short-Term U.S. Treasury  Trust, Dean Witter  Limited
Term  Municipal Trust,  Dean Witter  Short-Term Bond  Fund and  five Dean Witter
Funds which  are money  market funds  (the foregoing  eight non-CDSC  funds  are
hereinafter  referred to as  the "Exchange Funds"). Exchanges  may be made after
the shares  of  the Fund  acquired  by purchase  (not  by exchange  or  dividend
reinvestment)  have been held  for thirty days.  There is no  waiting period for
exchanges of shares acquired by exchange or dividend reinvestment.

    An exchange to another CDSC  fund or any Exchange Fund  that is not a  money
market  fund is on the basis of the next calculated net asset value per share of
each fund after  the exchange order  is received. When  exchanging into a  money
market  fund from the Fund, shares  of the Fund are redeemed  out of the Fund at
their next calculated  net asset value  and the proceeds  of the redemption  are
used  to  purchase shares  of the  money market  fund at  their net  asset value
determined the  following day.  Subsequent exchanges  between any  of the  money
market  funds and any  of the CDSC funds  can be effected on  the same basis. No
contingent deferred  sales  charge  ("CDSC")  is imposed  at  the  time  of  any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund acquired in exchange for shares of another CDSC fund having a
different  CDSC schedule  than that  of this  Fund will  be subject  to the CDSC
schedule of this  Fund, even  if such  shares are  subsequently reexchanged  for
shares  of the  CDSC fund  originally purchased. During  the period  of time the
shareholder remains in the  Exchange Fund (calculated from  the last day of  the
month  in which the Exchange Fund shares were acquired), the holding period (for
the purpose of determining the rate of the CDSC) is frozen. If those shares  are
subsequently  reexchanged  for  shares  of  a  CDSC  fund,  the  holding  period
previously frozen when the first  exchange was made resumes  on the last day  of
the month in which shares of a CDSC fund are reacquired. Thus, the CDSC is based
upon  the time (calculated as described above) the shareholder was invested in a
CDSC fund (see "Redemptions and Repurchases--Contingent Deferred Sales Charge").
However, in the case of shares exchanged into an Exchange Fund on or after April
23, 1990, upon a redemption of shares  which results in a CDSC being imposed,  a
credit  (not to exceed the amount of the  CDSC) will be given in an amount equal
to the Exchange  Fund 12b-1  distribution fees incurred  on or  after that  date
which  are attributable to those shares.  (Exchange Fund 12b-1 distribution fees
are described in the prospectuses for those funds.)

    In addition, shares of the  Fund may be acquired  in exchange for shares  of
Dean  Witter Funds sold  with a front-end sales  charge ("front-end sales charge
funds"), but shares  of the  Fund, however acquired,  may not  be exchanged  for
shares  of  front-end sales  charge funds.  Shares  of a  CDSC fund  acquired in
exchange for shares of a front-end sales charge fund (or in exchange for  shares
of    other   Dean   Witter   Funds   for    which   shares   of   a   front-end

                                                                              11
<PAGE>
sales charge fund have been  exchanged) are not subject  to any CDSC upon  their
redemption.

    Purchases  and  exchanges should  be made  for  investment purposes  only. A
pattern of frequent  exchanges may  be deemed by  the Investment  Manager to  be
abusive and contrary to the best interests of the Fund's other shareholders and,
at  the Investment Manager's discretion, may be limited by the Fund's refusal to
accept additional purchases  and/or exchanges  from the  investor. Although  the
Fund  does not  have any  specific definition of  what constitutes  a pattern of
frequent exchanges,  and  will  consider all  relevant  factors  in  determining
whether  a particular situation is abusive and contrary to the best interests of
the Fund and its other shareholders, investors should be aware that the Fund and
each of the other Dean Witter Funds  may in their discretion limit or  otherwise
restrict  the number of  times this Exchange  Privilege may be  exercised by any
investor. Any such restriction will be made  by the Fund on a prospective  basis
only,  upon notice  to the  shareholder not later  than ten  days following such
shareholder's  most  recent  exchange.  Also,  the  Exchange  Privilege  may  be
terminated  or revised at  any time by the  Fund and/or any  of such Dean Witter
Funds for which shares of the Fund have been exchanged, upon such notice as  may
be  required by applicable regulatory  agencies. Shareholders maintaining margin
accounts with  DWR  or another  Selected  Broker-Dealer are  referred  to  their
account  executive  regarding restrictions  on exchange  of  shares of  the Fund
pledged in the margin account.

    The current prospectus for each  fund describes its investment  objective(s)
and  policies, and  shareholders should obtain  a copy and  examine it carefully
before investing. Exchanges  are subject to  the minimum investment  requirement
and  any other conditions imposed by each  fund. An exchange will be treated for
federal income tax purposes the same as a repurchase or redemption of shares, on
which the shareholder may realize a  capital gain or loss. However, the  ability
to deduct capital losses on an exchange may be limited in situations where there
is  an exchange of shares within ninety days after the shares are purchased. The
Exchange Privilege is only available in states where an exchange may legally  be
made.

    If DWR or another Selected Broker-Dealer is the current dealer of record and
its  account  numbers  are part  of  the account  information,  shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean  Witter
Funds  (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege  by  contacting  their   account  executive  (no  Exchange   Privilege
Authorization  Form is required). Other shareholders (and those shareholders who
are clients  of DWR  or another  Selected  Broker-Dealer but  who wish  to  make
exchanges  directly by writing or telephoning  the Transfer Agent) must complete
and forward  to the  Transfer Agent  an Exchange  Privilege Authorization  Form,
copies  of  which  may be  obtained  from  the Transfer  Agent,  to  initiate an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer Agent at (800) 526-3143 (toll free).

    The  Fund  will  employ  reasonable  procedures  to  confirm  that  exchange
instructions  communicated over the  telephone are genuine.  Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security  or other tax  identification number and  DWR or  other
Selected  Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.

    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and  4:00 p.m., New York time,  on any day the New  York
Stock  Exchange is  open. Any  shareholder wishing to  make an  exchange who has
previously filed an Exchange Privilege Authorization  Form and who is unable  to
reach  the Fund  by telephone should  contact his  or her DWR  or other Selected
Broker-Dealer account  executive, if  appropriate, or  make a  written  exchange
request.  Shareholders are  advised that during  periods of  drastic economic or
market changes, it  is possible that  the telephone exchange  procedures may  be
difficult to implement, although this has not been the case with the Dean Witter
Funds in the past.

    Shareholders  should  contact  their  DWR  or  other  Selected Broker-Dealer
account executive  or  the Transfer  Agent  for further  information  about  the
Exchange Privilege.

REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------

REDEMPTION.   Shares of the Fund can be redeemed for cash at any time at the net
asset value per share next determined; however, such redemption proceeds may  be
reduced  by the amount of any  applicable contingent deferred sales charges (see
below). If shares are held in  a Shareholder Investment Account without a  share
certificate,  a written request  for redemption to the  Fund's Transfer Agent at
P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by the
shareholder, the shares may be redeemed by surrendering the certificates with  a
written  request for redemption, along  with any additional information required
by the Transfer Agent.

CONTINGENT DEFERRED SALES CHARGE.   Shares of  the Fund which  are held for  six
years or more after purchase (calculated from the last day of the month in which
the   shares  were   purchased)  will  not   be  subject  to   any  charge  upon

12
<PAGE>
redemption. Shares redeemed sooner than  six years after purchase may,  however,
be  subject to  a charge  upon redemption. This  charge is  called a "contingent
deferred sales charge" ("CDSC"), which will be a percentage of the dollar amount
of shares redeemed and will be assessed on an amount equal to the lesser of  the
current  market value or the cost of the shares being redeemed. The size of this
percentage will depend upon how long the shares have been held, as set forth  in
the table below:

<TABLE>
<CAPTION>
                                                       CONTINGENT DEFERRED
                    YEAR SINCE                             SALES CHARGE
                     PURCHASE                           AS A PERCENTAGE OF
                   PAYMENT MADE                          AMOUNT REDEEMED
- --------------------------------------------------  --------------------------
<S>                                                 <C>
First.............................................               5.0%
Second............................................               4.0%
Third.............................................               3.0%
Fourth............................................               2.0%
Fifth.............................................               2.0%
Sixth.............................................               1.0%
Seventh and thereafter............................             None
</TABLE>

    A  CDSC will not be imposed on:  (i) any amount which represents an increase
in value of shares purchased within the six years preceding the redemption; (ii)
the current net asset value of shares purchased more than six years prior to the
redemption; and (iii) the  current net asset value  of shares purchased  through
reinvestment  of dividends or  distributions and/or shares  acquired in exchange
for shares of Dean Witter Funds sold  with a front-end sales charge or of  other
Dean Witter Funds acquired in exchange for such shares. Moreover, in determining
whether  a CDSC is applicable it will  be assumed that amounts described in (i),
(ii), and (iii) above (in that order)  are redeemed first. In addition, no  CDSC
will  be imposed on redemptions  of shares which were  purchased by the employee
benefit plans  established  by  DWR  and  SPS  Transaction  Services,  Inc.  (an
affiliate  of DWR) for their employees as  qualified under Section 401(k) of the
Internal Revenue Code.

    In addition, the CDSC, if otherwise  applicable, will be waived in the  case
of  (i) redemptions  of shares held  at the  time a shareholder  dies or becomes
disabled, only  if the  shares  are (a)  registered either  in  the name  of  an
individual  shareholder (not a trust),  or in the names  of such shareholder and
his or her spouse as joint tenants with right of survivorship, or (b) held in  a
qualified  corporate  or  self-employed retirement  plan,  Individual Retirement
Account or Custodial Account  under Section 403(b) (7)  of the Internal  Revenue
Code,  provided in either case that the  redemption is requested within one year
of the death  or initial determination  of disability, and  (ii) redemptions  in
connection  with the  following retirement  plan distributions:  (a) lump-sum or
other distributions from a qualified corporate or self-employed retirement  plan
following  retirement (or in the case of a "key employee" of a "top heavy" plan,
following attainment  of  age 59  1/2);  (b) distributions  from  an  Individual
Retirement  Account or Custodial Account under Section 403(b)(7) of the Internal
Revenue Code following attainment of age 59 1/2; and (c) a tax-free return of an
excess contribution to an  IRA. For the purpose  of determining disability,  the
Distributor  utilizes the definition of disability contained in Section 72(m)(7)
of the  Internal Revenue  Code, which  relates  to the  inability to  engage  in
gainful  employment. All waivers  will be granted only  following receipt by the
Distributor of confirmation of the investor's entitlement.

REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to  repurchase
shares  represented by a  share certificate which  is delivered to  any of their
offices. Shares held in a shareholder's account without a share certificate  may
also be repurchased by DWR and other Selected Broker-Dealers upon the telephonic
request  of the shareholder.  The repurchase price  is the net  asset value next
computed (see "Purchase of Fund Shares") after such repurchase order is received
by DWR or other Selected Broker-Dealer, reduced by any applicable CDSC.

    The CDSC, if any, will be the only fee imposed by the Fund, the Distributor,
DWR or  other Selected  Broker-Dealers.  The offer  by  DWR and  other  Selected
Broker-Dealers  to repurchase shares may be  suspended without notice by them at
any time. In that event, shareholders may redeem their shares through the Fund's
Transfer Agent as set forth above under "Redemption."

PAYMENT FOR SHARES REDEEMED  OR REPURCHASED.  Payment  for shares presented  for
repurchase  or redemption will be made by  check within seven days after receipt
by the Transfer Agent of the  certificate and/or written request in good  order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances,  e.g., when normal  trading is not  taking place on  the New York
Stock Exchange. If  the shares to  be redeemed have  recently been purchased  by
check,  payment of the redemption  proceeds may be delayed  for the minimum time
needed to verify that the check used  for investment has been honored (not  more
than  fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders  maintaining  margin   accounts  with  DWR   or  another   Selected
Broker-Dealer  are referred to their account executive regarding restrictions on
redemption of shares of the Fund pledged in the margin account.

REINSTATEMENT PRIVILEGE.  A shareholder who  has had his or her shares  redeemed
or  repurchased and  has not  previously exercised  this reinstatement privilege
may, within  thirty  days  after  the date  of  the  redemption  or  repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares  of the  Fund at  net asset value  next determined  after a reinstatement
request, together  with the  proceeds, is  received by  the Transfer  Agent  and
receive  a pro-rata credit for any CDSC  paid in connection with such redemption
or repurchase.

INVOLUNTARY REDEMPTION.  The Fund reserves the right, on sixty days' notice,  to
redeem,  at their  net asset  value, the shares  of any  shareholder (other than
shares held  in an  Individual  Retirement Account  or custodial  account  under
Section 403(b)(7) of the Internal Revenue Code) whose

                                                                              13
<PAGE>
shares have a value of less than $100 as a result of redemptions or repurchases,
or  such lesser amount as may be fixed by the Trustees. However, before the Fund
redeems such shares and  sends the proceeds to  the shareholder, it will  notify
the  shareholder that the value of the shares is less than $100 and allow him or
her sixty days to make an additional investment in an amount which will increase
the value  of his  or her  account  to $100  or more  before the  redemption  is
processed. No CDSC will be imposed on any involuntary redemption.

DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------

DIVIDENDS  AND DISTRIBUTIONS.   The Fund declares  dividends from net investment
income on  each  day  the New  York  Stock  Exchange is  open  for  business  to
shareholders  of record as of the close  of business the preceding business day.
The amount of dividend may  fluctuate from day to  day. Such dividends are  paid
monthly.  The Fund intends to distribute substantially all of its net investment
income on an annual basis.

    The Fund may distribute quarterly net realized short-term capital gains,  if
any, in excess of any net realized long-term capital losses. The Fund intends to
distribute  dividends from  net long-term capital  gains, if any,  at least once
each year. The Fund may,  however, elect to retain all  or a portion of any  net
long-term  capital gains  in any  year for reinvestment.  Also, the  Fund may at
times make  payments  from sources  other  than  income or  net  capital  gains.
Payments  from such sources would, in effect, represent a return of a portion of
each shareholder's investment. All, or a portion, of such payments would not  be
taxable to shareholders.

    All dividends and any capital gains distributions will be paid in additional
Fund   shares  (without  sales   charge)  and  automatically   credited  to  the
shareholder's account  without  issuance  of  a  share  certificate  unless  the
shareholder  requests  in  writing  that  all  dividends  or  all  dividends and
distributions be paid in cash. (See "Shareholder Services-- Automatic Investment
of Dividends and Distributions".)

TAXES.  Because  the Fund  intends to distribute  substantially all  of its  net
investment  income and net short-term capital gains to shareholders and continue
to qualify as a regulated investment company under Subchapter M of the  Internal
Revenue  Code, it  is not  expected that the  Fund will  be required  to pay any
federal income tax on such income and capital gains.

    Shareholders who are  required to pay  taxes on their  income will  normally
have  to pay federal income taxes, and  any applicable state and/or local income
taxes, on  the dividends  and distributions  they receive  from the  Fund.  Such
dividends  and  distributions, to  the  extent that  they  are derived  from net
investment  income  and  net  short-term  capital  gains,  are  taxable  to  the
shareholder  as ordinary dividend  income regardless of  whether the shareholder
receives such distributions in additional shares or in cash.

    Distributions of  net  long-term  capital  gains, if  any,  are  taxable  to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional  shares or in cash. Capital  gains distributions are not eligible for
the corporate dividends received deduction.

    After the  end  of  the  calendar  year,  shareholders  will  be  sent  full
information on their dividends and capital gains distributions for tax purposes.
To  avoid  being subject  to a  31%  federal backup  withholding tax  on taxable
dividends, capital  gains  distributions and  the  proceeds of  redemptions  and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to accuracy.

    The   foregoing  discussion  relates  solely   to  the  federal  income  tax
consequences of an investment in the Fund. Distributions may also be subject  to
state  and local taxes; therefore, each shareholder is advised to consult his or
her own tax adviser.

PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------

From time to time  the Fund may  quote its "yield"  and/or its"total return"  in
advertisements  and sales literature. Both the yield and the total return of the
Fund are based on  historical earnings and are  not intended to indicate  future
performance.  The  yield of  the Fund  is  computed by  dividing the  Fund's net
investment income over a  30-day period by an  average value (using the  average
number of shares entitled to receive dividends and the net asset value per share
at  the  end  of  the  period), all  in  accordance  with  applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to derive the Fund's yield.

    The "average annual total return" of the Fund refers to a figure  reflecting
the  average annualized  percentage increase  (or decrease)  in the  value of an
initial investment in  the Fund  of $1,000  over periods  of one,  five and  ten
years.  Average annual total return reflects all  income earned by the Fund, any
appreciation or depreciation of the Fund's assets, all expenses incurred by  the
Fund  and all sales  charges which would be  incurred by redeeming shareholders,
for the  stated periods.  It  also assumes  reinvestment  of all  dividends  and
distributions paid by the Fund.

    In  addition to the foregoing, the Fund  may advertise its total return over
different periods of time by means of

14
<PAGE>
aggregate, average, and  year-by-year or  other types of  total return  figures.
Such  calculations  may  or may  not  reflect  the deduction  of  the contingent
deferred sales charge which, if reflected, would reduce the performance  quoted.
The  Fund may also advertise the  growth of hypothetical investments of $10,000,
$50,000 and $100,000 in shares of the Fund. The Fund from time to time may  also
advertise  its performance relative to  certain performance rankings and indexes
compiled by independent organizations.

ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------

VOTING RIGHTS.  All shares of beneficial  interest of the Fund are of $0.01  par
value and are equal as to earnings, assets and voting privileges.

    The  Fund is  not required  to hold Annual  Meetings of  Shareholders and in
ordinary circumstances  the Fund  does not  intend to  hold such  meetings.  The
Trustees  may call  Special Meetings of  Shareholders for  action by shareholder
vote as may be required  by the Act or the  Declaration of Trust. Under  certain
circumstances  the Trustees may be  removed by action of  the Trustees or by the
shareholders.

    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the obligations of  the
Fund.  However,  the  Declaration of  Trust  contains an  express  disclaimer of
shareholder liability for acts  or obligations of the  Fund, requires that  Fund
obligations  include  such  disclaimer,  and  provides  for  indemnification and
reimbursement of expenses out  of the Fund's property  for any shareholder  held
personally  liable  for  the  obligations  of the  Fund.  Thus,  the  risk  of a
shareholder incurring  financial loss  on account  of shareholder  liability  is
limited  to circumstances in which  the Fund itself would  be unable to meet its
obligations. Given the above limitations on shareholder personal liability,  and
the  nature of  the Fund's  assets and operations,  the possibility  of the Fund
being unable  to  meet  its  obligations  is  remote  and,  in  the  opinion  of
Massachusetts  counsel to  the Fund, the  risk to Fund  shareholders of personal
liability is remote.

CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean  Witter
Services Company Inc. and the Distributor are subject to a strict Code of Ethics
adopted  by those companies. The  Code of Ethics is  intended to ensure that the
interests of shareholders  and other clients  are placed ahead  of any  personal
interest,  that no undue personal benefit is obtained from a person's employment
activities and that actual and potential  conflicts of interest are avoided.  To
achieve  these goals and comply with regulatory requirements, the Code of Ethics
requires, among other things, that personal securities transactions by employees
of the companies be subject to an  advance clearance process to monitor that  no
Dean  Witter Fund is engaged at the same time  in a purchase or sale of the same
security. The  Code of  Ethics bans  the purchase  of securities  in an  initial
public  offering, and also prohibits engaging in futures and option transactions
and profiting on short-term trading (that is, a purchase within sixty days of  a
sale  or a  sale within sixty  days of a  purchase) of a  security. In addition,
investment personnel may  not purchase  or sell  a security  for their  personal
account  within thirty days before  or after any transaction  in any Dean Witter
Fund managed  by them.  Any violations  of the  Code of  Ethics are  subject  to
sanctions,  including  reprimand,  demotion  or  suspension  or  termination  of
employment. The Code  of Ethics  comports with regulatory  requirements and  the
recommendations  in  the  recent  report  by  the  Investment  Company Institute
Advisory Group on Personal Investing.

SHAREHOLDER INQUIRIES.  All inquiries regarding  the Fund should be directed  to
the  Fund at the  telephone numbers or address  set forth on  the front cover of
this Prospectus.

                                                                              15
<PAGE>

DEAN WITTER
U.S. GOVERNMENT SECURITIES TRUST
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048

TRUSTEES
Jack F. Bennett
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Dr. Manuel H. Johnson
Paul Kolton
Michael E. Nugent
Philip J. Purcell
John L. Schroeder

OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive
Officer
Sheldon Curtis
Vice President, Secretary and
General Counsel
Rajesh K. Gupta
Vice President
Thomas F. Caloia
Treasurer

CUSTODIAN
The Bank of New York
90 Washington Street
New York, New York 10286

TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust Company
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311

INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036

INVESTMENT MANAGER
Dean Witter InterCapital Inc.


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