EATON VANCE GOVERNMENT OBLIGATIONS TRUST
497, 1995-03-03
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<PAGE>
                     EATON VANCE SHORT-TERM TREASURY FUND
                         Supplement to the Prospectus
                                     dated
                                 May 1, 1994

     Eaton Vance  Short-Term  Treasury Fund (the "Fund")  revised its investment
objective  and  certain  investment  policies  effective  January 1,  1995.  The
following replaces in its entirety the disclosure found in the Fund's prospectus
under the captions "The Fund",  "The Fund's  Investment  Objective" and "How the
Fund Invests its Assets" (see pages 4 and 5 of the prospectus):

THE FUND'S INVESTMENT OBJECTIVE
     The Fund is a no-load diversified mutual fund which continuously offers its
shares of beneficial interest to the public. The Fund's investment  objective is
to seek  current  income and  liquidity.  The Fund invests  exclusively  in U.S.
Treasury obligations (bills, notes and bonds) with a remaining maturity of up to
five years and will maintain a dollar weighted average portfolio maturity of not
more than one year. The Fund's investment  objective is a nonfundamental  policy
which may be changed by Trustee vote. The Trustees, however, have indicated that
they  intend to  submit  any  material  change in the  investment  objective  to
shareholders for their approval.  The Fund's  investment  adviser is Eaton Vance
Management (the "Investment  Adviser").  The Fund provides  shareholders ease of
investment  and redemption by allowing  direct  purchases,  check-writing,  wire
purchases and redemptions, and access through broker-dealers.  No commissions or
redemption fees are charged on Fund purchases or redemptions.

HOW THE FUND INVESTS ITS ASSETS
     The Fund invests exclusively in U.S. Treasury  obligations with a remaining
maturity of up to five years.  U.S. Treasury  obligations  include the following
(which differ in their interest rates,  maturities and times of issuance):  U.S.
Treasury bills (maturities of one year or less), U.S. Treasury notes (maturities
of one to ten years) and U.S.  Treasury bonds  (generally  maturities of greater
than ten years).  The Fund invests in U.S.  Treasury notes and bonds only to the
extent that their remaining maturity is five years or less. U.S. Treasury bills,
notes and bonds are supported by the full faith and credit of the United States.

                                       -1-
Date:  March 1, 1995                                                        TYPS



<PAGE>


     The Fund will maintain a dollar weighted average portfolio  maturity of not
more than one year. In measuring the dollar weighted average portfolio  maturity
of the Fund,  the Fund will use the concept of "duration."  Duration  represents
the dollar weighted average maturity of expected cash flows (i.e.,  interest and
principal payments) on one or more debt obligations, discounted to their present
values. The duration of an obligation is always equal to or less than its stated
maturity and is related to the degree of  volatility  in the market value of the
obligation.  Maturity  measures only the time until a debt security provides its
final payment;  it takes no account of the pattern of a security's payments over
time.  Duration  takes both  interest and  principal  payments into account and,
thus, in the Investment  Adviser's opinion, is a more accurate measure of a debt
security's longevity.

Investment Considerations

     The net  asset  value of the  Fund's  shares  will  change in  response  to
interest  rate  fluctuations.  When  interest  rates  decline,  the  value  of a
portfolio  primarily  invested  in debt  securities  can be  expected  to  rise.
Conversely,  when  interest  rates  rise,  the  value of a  portfolio  primarily
invested in debt  securities  can be expected  to  decline.  However,  a shorter
maturity is generally  associated with a lower level of market value volatility.
Accordingly,  the  Investment  Adviser  expects  that the net asset value of the
Fund's  shares  normally  will  fluctuate  significantly  less  than  that  of a
longer-term  bond fund since the dollar weighted average  portfolio  maturity of
the Fund at all times will not exceed one year.

     The  Fund has  adopted  certain  fundamental  investment  restrictions  and
policies  which  are  enumerated  in  detail  in  the  Statement  of  Additional
Information  and which may not be changed  unless  authorized  by a  shareholder
vote. Except for such restrictions and policies,  the investment policies of the
Fund are not fundamental policies and accordingly may be changed by the Trustees
without  obtaining  the  approval  of  the  Fund's  shareholders.   Among  other
restrictions,  the Fund may not, with respect to 75% of its total assets, invest
more  than 5% of its  total  assets  in the  securities  of a single  issuer  or
purchase more than 10% of the outstanding voting securities of an issuer (except
obligations  issued  or  guaranteed  by the U.S.  Government,  its  agencies  or
instrumentalities  and except  securities  of other  investment  companies);  or
invest 25% or more of its total assets in any single industry (provided there is
no  limitation  with respect to  obligations  issued or  guaranteed  by the U.S.
government or any of its agencies or instrumentalities).

                                      -2-

<PAGE>

The  shareholders  have authorized the Fund to invest  substantially  all of its
assets in an open-end  management  investment  company having  substantially the
same  investment  policies and  restrictions as the Fund. The Board of Trustees,
should it implement the new investment policy, would invest substantially all of
the assets of the Fund in the Short-Term  Treasury  Portfolio (the "Portfolio").
The  Portfolio  is a trust  which,  like the  Fund,  would be  registered  as an
open-end management investment company under the Investment Company Act of 1940.
It is anticipated that the Fund, by investing substantially all of its assets in
the  Portfolio,  would be in a position  to  realize  certain  benefits  from an
increase in the size of the  underlying  investment  portfolio.  There can be no
assurance that these anticipated benefits will be realized.  This policy has not
been implemented  given the current asset size of the Fund and the lack of other
investment  vehicles  available to invest in the  Portfolio.  Conversion to this
two-tier investment structure may, however, become attractive in the future.






















                                      -3-





<PAGE>


                     EATON VANCE SHORT-TERM TREASURY FUND

     A MUTUAL  FUND  SEEKING A HIGH LEVEL OF INCOME,  CONSISTENT  WITH SAFETY OF
PRINCIPAL  AND  MAINTENANCE  OF  LIQUIDITY,   BY  INVESTING  IN  U.S.   TREASURY
OBLIGATIONS HAVING A REMAINING MATURITY OF LESS THAN ONE YEAR.

     This Prospectus is designed to provide you with information you should know
before investing.  Please retain this document for future  reference.  Shares of
the Fund are not deposits or  obligations  of, or guaranteed or endorsed by, any
bank or other insured depository  institution,  and are not Federally insured by
the Federal  Deposit  Insurance  Corporation,  the Federal  Reserve Board or any
other government agency. Shares of the Fund involve investment risks,  including
fluctuations  in value  and the  possible  loss of some or all of the  principal
investment.

     Eaton  Vance   Short-Term   Treasury   Fund  (the  "Fund")  is  a  no-load,
continuously  offered,  diversified  mutual  fund  which  seeks a high  level of
income,  consistent  with safety of principal and  maintenance of liquidity,  by
investing in U.S. Treasury  obligations having a remaining maturity of less than
one year. The Fund has a 12b-1 Plan as described herein.

     A Statement of  Additional  Information  dated May 1, 1994 for the Fund, as
supplemented  from time to time, has been filed with the Securities and Exchange
Commission and is incorporated herein by reference. This Statement of Additional
Information is available  without charge from the Fund's Principal  Underwriter,
Eaton Vance Distributors,  Inc., 24 Federal Street,  Boston, MA 02110 (telephone
(800) 225-6265).  The Fund's Investment Adviser is Eaton Vance Management at the
same address.

- ------------------------------------------------------------------------------
     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURI-
      TIES 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 PROS-
        PECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
- ------------------------------------------------------------------------------
<TABLE>

TABLE OF CONTENTS

<S>                                                  <C>  <C>                                              <C>
Shareholder and Fund Expenses ......................   2  Reports to Shareholders ........................  11
The Fund's Financial Highlights ....................   3  The Fund's Investment Adviser is Eaton Vance ...  11
The Fund ...........................................   4  How the Fund Values Its Shares .................  12
The Fund's Investment Objective ....................   4  The Lifetime Investing Account/Distribution
How the Fund Invests Its Assets ....................   4    Options ......................................  13
Distributions and Taxes ............................   5  Eaton Vance Shareholder Services ...............  14
How to Buy Shares of the Fund ......................   7  Distribution Plan ..............................  15
How to Redeem or Sell Fund Shares ..................   8  Performance and Yield Information ..............  16
The Fund is an Open-End Mutual Fund ................  10  Backup Withholding .............................  16
- ------------------------------------------------------------------------------
</TABLE>
                         PROSPECTUS DATED MAY 1, 1994



<PAGE>


SHAREHOLDER AND FUND EXPENSES

SHAREHOLDER TRANSACTION EXPENSES
  Sales Charges Imposed on Purchases of Shares                             None
  Sales Charges Imposed on Reinvested Distributions                        None
  Sales Charges Imposed on Redemptions                                     None

ANNUAL FUND OPERATING EXPENSES
(as a percentage of average net assets)
  Investment Adviser Fee                                                  0.17%*
  Rule 12b-1 Distribution Expenses                                        0.25%
  Other Expenses                                                          0.18%
                                                                          -----
      Total Operating Expenses                                            0.60%
                                                                          -----
                                                                          -----
- ---------
*After reduction by Investment Adviser.

EXAMPLE                                 1 YEAR     3 YEARS    5 YEARS   10 YEARS
                                        ------     -------    -------   --------

You would pay the following expenses
on a $1,000 investment, assuming (a)
5% annual return and (b) redemption
at the end of each period:                $6         $19        $33        $75

Notes:
(1) The purpose of the above table is to assist investors in  understanding  the
    various costs and expenses  that  investors in the Fund may bear directly or
    indirectly. See "The Fund's Financial Highlights" and "The Fund's Investment
    Adviser is Eaton  Vance".  The table and Example  should not be considered a
    representation  of past or future  expenses as the  foregoing  expenses  are
    based on operating  expenses for the fiscal year ended December 31, 1993 and
    have been  calculated by assuming the reduction of the  investment  advisory
    fee to 0.17%. Actual expenses may be greater or less than those shown in the
    table and Example.  Because the Fund makes payments  under its  Distribution
    Plan adopted under Rule 12b-1, a long-term shareholder may pay more than the
    economic  equivalent of the maximum  front-end  sales charge  permitted by a
    rule  of  the  National   Association  of  Securities   Dealers,   Inc.  See
    "Distribution  Plan." If no reduction  was made,  the annual Fund  operating
    expenses as a percentage of average net assets would be: Investment  Adviser
    Fee -- 0.27%, Rule 12b-1  Distribution  Expenses -- 0.25%, Other Expenses --
    0.18%, and Total Operating  Expenses -- 0.70%; and the Example would read as
    follows:

EXAMPLE                                 1 YEAR     3 YEARS    5 YEARS   10 YEARS
                                        ------     -------    -------   --------
You would pay the following expenses
on a $1,000 investment, assuming (a)
5% annual return and (b) redemption
at the end of each period:                $7         $22        $39        $87

(2) The Fund's monthly advisory fee has two components, a fee based on daily net
    assets  and a fee  based  on daily  gross  income,  as set  forth in the fee
    schedule on page 10.


<PAGE>

THE FUND'S FINANCIAL HIGHLIGHTS

The  following  information  should be read in  conjunction  with the  financial
statements included in the Statement of Additional Information,  which have been
included  in  reliance  upon  the  report  of  Coopers  &  Lybrand,  independent
accountants, as experts in accounting and auditing. The financial highlights for
the period from the date of the  initial  public  offering,  February 4, 1991 to
December 31, 1991,  presented here, were audited by another auditor whose report
dated  January 24, 1992,  expressed  an  unqualified  opinion on such  financial
highlights.

<TABLE>
<CAPTION>
                                                                     YEAR ENDED DECEMBER 31,
                                                             ---------------------------------------
                                                                 1993(1)        1992           1991++
                                                                 -------        ----           ------
                                                                 
<S>                                                              <C>            <C>           <C>   
NET ASSET VALUE, beginning of year .......................       $54.30         $52.64        $50.18
                                                                  -----          -----         -----
INCOME FROM OPERATIONS:
  Net investment income ..................................       $ 1.34         $ 1.61        $ 2.15
  Net realized and unrealized gain (loss) on investments .        (0.06)          0.05          0.31
                                                                  -----          -----         -----
    Total income from operations .........................       $ 1.28         $ 1.66        $ 2.46
                                                                  -----          -----         -----
NET ASSET VALUE, end of year .............................       $55.58         $54.30        $52.64
                                                                  -----          -----         -----
                                                                  -----          -----         -----
TOTAL RETURN .............................................        2.36%          3.15%         4.90%
RATIOS/SUPPLEMENTAL DATA:
  Net assets, end of year (000's omitted) ................       $1,743         $4,917      $100,976
  Ratio of expenses to average net assets** ..............        0.60%          0.60%         0.60%*
  Ratio of net investment income to average net assets** .        2.48%          3.01%         4.66%*

 *Computed on an annualized basis.
**The expenses related to the operation of the Fund reflect a reduction
  of the  investment  adviser fee. Had such action not been taken,  net
  investment  income  per  share  and the  ratios  would  have  been as
  follows:

NET INVESTMENT INCOME PER SHARE ..........................       $ 1.28         $ 1.56        $ 2.07
                                                                  -----          -----         -----
                                                                  -----          -----         -----
RATIOS (As a percentage of average net assets):
    Expenses .............................................        0.70%          0.70%         0.78%*
                                                                  -----          -----         -----
                                                                  -----          -----         -----
    Net investment income ................................        2.38%          3.11%         4.49%*
                                                                  -----          -----         -----
                                                                  -----          -----         -----
Note: Certain of the per share amounts have been computed using average shares
outstanding.

(1)Further  information   regarding  the  performance  of  the  Fund  is
   contained in the Fund's  annual report to  shareholders  which may be
   obtained   without   charge  by  contacting   the  Fund's   Principal
   Underwriter, Eaton Vance Distributors, Inc.
++Period from the date of initial public offering, February 4, 1991, to
  December 31, 1991. For the period from the start of business, January
  11, 1991,  to February 3, 1991,  net  investment  income  aggregating
  $0.18 per share ($367) was earned by the Fund. The financial highlights
  for the period were audited by the Fund's previous auditors.
</TABLE>



<PAGE>

THE FUND

Eaton Vance Short-Term  Treasury Fund (the "Fund") is a diversified  mutual fund
which continuously  offers its shares of beneficial  interest  ("shares") to the
public.  The  Fund's  investment  objective  is to seek a high  level of income,
consistent with safety of principal and  maintenance of liquidity,  by investing
in U.S. Treasury  obligations having a remaining maturity of less than one year.
The Fund's  investment  adviser is Eaton Vance Management  ("Eaton Vance").  The
Fund provides  shareholders ease of investment and redemption by allowing direct
purchases,  check-writing,  same-day wire purchases and redemptions,  and access
through  broker-dealers.  No commissions or redemption  fees are charged on Fund
purchases or  redemptions.  The Fund has been rated by a  nationally  recognized
statistical  rating  organization in the highest category for short-term  funds.

THE FUND'S INVESTMENT OBJECTIVE

The Fund's  investment  objective is to seek a high level of income,  consistent
with safety of principal  and  maintenance  of  liquidity,  by investing in U.S.
Treasury  obligations  having a  maturity  of less  than one  year.  The  Fund's
investment  objective  is  a  nonfundamental   policy  which  is  changeable  if
authorized by Trustee vote.  The Trustees,  however,  have  indicated  that they
intend to submit any material change in the investment objective to shareholders
for their approval.

HOW THE FUND INVESTS ITS ASSETS

The Fund invests  exclusively in U.S.  Treasury bills,  notes and bonds having a
remaining maturity of less than one year. U.S. Treasury  instruments include the
following obligations which differ in their interest rates, maturities and times
of issuance: U.S. Treasury bills (maturities of one year or less), U.S. Treasury
notes  (maturities  of one to ten  years)  and U.S.  Treasury  bonds  (generally
maturities of greater than ten years).  The Fund intends to invest  primarily in
U.S.  Treasury bills. The Fund invests in U.S.  Treasury notes and bonds only to
the extent that their remaining  maturity is less than one year.  U.S.  Treasury
bills, notes and bonds, are supported by the full faith and credit of the United
States.

     The Fund will maintain a dollar weighted average portfolio  maturity of not
more than ninety  days.  In  measuring  the dollar  weighted  average  portfolio
maturity  of the Fund,  the Fund will use the  concept of  "duration."  Duration
represents the dollar  weighted  average  maturity of expected cash flows (i.e.,
interest and principal payments) on one or more debt obligations,  discounted to
their present  values.  The duration of an obligation is always equal to or less
than its stated  maturity  and is related  to the  degree of  volatility  in the
market value of the  obligation.  Maturity  measures  only the time until a debt
security  provides  its final  payment;  it takes no account of the pattern of a
security's  payments  over time.  Duration  takes both  interest  and  principal
payments into account and, thus, in the investment  adviser's opinion, is a more
accurate measure of a debt security's longevity.

INVESTMENT CONSIDERATIONS

     The net  asset  value of the  Fund's  shares  will  change in  response  to
interest  rate  fluctuations.  When  interest  rates  decline,  the  value  of a
portfolio  primarily  invested  in debt  securities  can be  expected  to  rise.
Conversely,  when  interest  rates  rise,  the  value of a  portfolio  primarily
invested in debt  securities  can be expected  to  decline.  However,  a shorter
maturity is generally  associated with a lower level of market value volatility.
Accordingly, it is expected by Eaton Vance that the net asset value of theFund's
shares  normally will  fluctuate  significantly  less than that of a longer-term
bond fund since the dollar weighted average portfolio maturity at all times will
not exceed ninety days.

     The  Fund has  adopted  certain  fundamental  investment  restrictions  and
policies  which  are  enumerated  in  detail  in  the  Statement  of  Additional
Information  and which may not be changed  unless  authorized  by a  shareholder
vote. Except for such restrictions and policies,  the investment policies of the
Fund are not fundamental policies and accordingly may be changed by the Trustees
without  obtaining  the  approval  of  the  Fund's  Shareholders.   Among  other
restrictions,  the Fund may not, with respect to 75% of its total assets, invest
more  than 5% of its  total  assets  in the  securities  of a single  issuer  or
purchase more than 10% of the outstanding voting securities of an issuer (except
obligations  issued  or  guaranteed  by the U.S.  Government,  its  agencies  or
instrumentalities  and except  securities  of other  investment  companies);  or
invest 25% or more of its total assets in any single industry (provided there is
no  limitation  with respect to  obligations  issued or  guaranteed  by the U.S.
government or any of its agencies or instrumentalities).

     At a meeting of  shareholders  of the Fund, the  shareholders  approved the
adoption  of a new  investment  policy  for  the  Fund  and  the  addition  of a
fundamental  investment provision to permit the Fund to invest substantially all
of its assets in an open-end management  investment company having substantially
the  same  investment  policies  and  restrictions  as the  Fund.  The  Board of
Trustees,   expects  to  implement  the  new  investment  policy,  by  investing
substantially all of the assets of the Fund in the Short-Term Treasury Portfolio
(the  "Portfolio") in 1994. The Portfolio is a trust which,  like the Fund, will
be registered as an open-end management  investment company under the Investment
Company Act of 1940. It is anticipated that the Fund, by investing substantially
all of its assets in the  Portfolio,  would be in a position to realize  certain
benefits from an increased size of the underlying  investment  portfolio.  There
can be no assurance that these anticipated benefits will be realized.

DISTRIBUTIONS AND TAXES

The Fund has elected to be  treated,  has  qualified  and intends to continue to
qualify each year as a regulated  investment  company under the Internal Revenue
Code (the "Code"). Accordingly, the Fund intends to satisfy certain requirements
relating  to  sources of its  income  and  diversification  of its assets and to
distribute a sufficient amount of its investment company taxable income so as to
effect such  qualification.  The Fund may also distribute part or all of its net
investment  income and  realized  capital  gains in  accordance  with the timing
requirements  imposed by the Code,  so as to reduce or avoid  Federal  income or
excise tax to the Fund.

     Under  the Code,  the  redemption  or  exchange  of  shares of a  regulated
investment  company would normally result in capital gain or loss if such shares
are held as capital assets.  However,  the Omnibus Budget  Reconciliation Act of
1993,  signed into law on August 10,  1993,  adds new Section  1258 to the Code,
which recharacterizes  capital gain from the disposition or other termination of
a position held as part of a "conversion  transaction" as ordinary income to the
extent of an  imputed  income  amount  based on a deemed  interest  computation.
Section 1258  applies to  conversion  transactions  entered into after April 30,
1993. A conversion  transaction  is defined to include,  among other  things,  a
transaction   which  is  marketed  or  sold  as  producing  a  capital  gain  if
substantially  all of a  taxpayer's  expected  return  from the  transaction  is
"attributable  to the  time  value  of the  taxpayer's  net  investment  in such
transaction."  The Secretary of the Treasury is also authorized to specify other
transactions  to be included in the  definition of a conversion  transaction  in
regulations  to be effective when  promulgated  by the  Secretary.  Section 1258
contains  many  ambiguities  and its scope is unclear;  it may be  clarified  or
refined in future  regulations or other official  pronouncements.  Until further
guidance is issued, it is unclear whether a purchase and subsequent  disposition
of Fund shares would be treated as a conversion  transaction under Section 1258.
Investors  should  consult  their own tax  advisers  concerning  whether  or not
Section 1258 may apply to their transactions in Fund shares.

     The  Fund  distributes  its net  investment  income  and  capital  gains to
shareholders  as  dividends  annually  to the  extent  required  for the Fund to
qualify as a regulated  investment  company under the Code and  generally  avoid
Federal income or excise tax to the Fund. Under current law, the Fund intends on
its tax return to treat as a distribution  of investment  company taxable income
and net  capital  gain the  portion of  redemption  proceeds  paid to  redeeming
shareholders that represents the redeeming  shareholders'  portion of the Fund's
undistributed  investment  company  taxable  income and net capital  gain.  This
practice,  which  involves  the use of  equalization  accounting,  will have the
effect of  reducing  the amount of income and gains that the Fund is required to
distribute as dividends to  shareholders  in order for the Fund to avoid Federal
income and excise tax. This practice may also reduce the amount of distributions
required to be made to  nonredeeming  shareholders  and defer the recognition of
taxable  income  by  such  shareholders.   However,  since  the  amount  of  any
undistributed  income will be reflected in the value of the Fund's  shares,  the
total return on a  shareholder's  investment  will not be reduced as a result of
the Fund's distribution policy. Investors who purchase shares shortly before the
record  date of a  distribution  will pay the full price for the shares and then
receive some portion of the price back as a taxable distribution.

     Capital gains, if any, realized by the Fund on sales of investments  during
the Fund's  taxable  year,  which  ends on  December  31,  will be offset by any
capital loss carryovers and will usually be distributed  after the close of such
taxable year, in compliance with the  distribution  requirements of the Internal
Revenue Code.  Distributions of net long-term capital gains included therein are
taxable to  shareholders as such,  whether paid in cash or additional  shares of
the Fund and regardless of the length of time Fund shares have been owned by the
shareholder.  Distributions of net short-term capital gains included therein are
taxable to shareholders as ordinary  income,  whether paid in cash or additional
shares of the Fund.  Certain  distributions  declared  in  October,  November or
December and paid the following  January will be taxable to  shareholders  as if
received on December 31 of the year in which they are declared.

     Annually, shareholders will receive one or more Forms 1099 to assist in the
reporting  on their  Federal and state  income tax  returns  the prior  calendar
year's  distributions,  proceeds from the redemption or exchange of Fund shares,
and Federal income tax (if any) withheld by the Fund's Transfer Agent.

     As a regulated  investment  company  under the Code,  the Fund does not pay
Federal income or excise taxes to the extent that it distributes to shareholders
its net investment  income and net realized capital gains in accordance with the
timing requirements imposed by the Code. For the taxable year ended December 31,
1993 the Fund did not incur any  Federal  income or excise tax  although  it may
incur such taxes in the future if management  determines  that retention of some
income  or gains is  appropriate.  Under  current  law,  provided  that the Fund
qualifies as a regulated investment company for Federal income tax purposes, the
Fund is not liable for any  income,  corporate  excise or  franchise  tax in the
Commonwealth  of  Massachusetts.  The Fund  incurred no state tax  liability  in
respect of its taxable year ended December 31, 1993.

STATE,  LOCAL AND FOREIGN TAXES

     Distributions of the Fund which are derived from interest on obligations of
the U.S.  Government will be exempt from personal and/or  corporate income taxes
in most  states.  The Fund will inform  shareholders  of the  proportion  of its
distributions which are derived from interest on such obligations.  Shareholders
are urged to consult their tax advisers  regarding the proper  treatment of such
portion of their  distributions for state and local income tax purposes and with
respect to state, local or foreign tax consequences of investing in the Fund.

HOW TO BUY SHARES OF THE FUND

Shares of the Fund are sold  without a sales  charge at the net asset value next
determined after the receipt of a purchase order as described below. The minimum
initial  purchase of shares is $5,000.  Once an account has been established the
investor may make  additional  investments  of $50 or more at any time. The Fund
reserves  the right to reject  any order for the  purchase  of its  shares or to
limit or suspend,  without prior notice,  the offering of its shares. See "Eaton
Vance Shareholder Services" below.

     The initial net asset value at which shares were offered was $50 per share.

FUND SHARES MAY BE PURCHASED IN FOLLOWING WAYS:

     * PURCHASES THROUGH AUTHORIZED FIRMS.  Investors may purchase shares of the
       Fund through certain financial service firms ("Authorized  Firms") at the
       net  asset  value  per  share  of the Fund  next  determined  after  such
       purchase.  Pursuant  to  its  Distribution  Agreement  with  Eaton  Vance
       Distributors,  Inc. ("the Principal  Underwriter"  or "EVD"),  24 Federal
       Street, Boston, MA 02110, a wholly-owned subsidiary of Eaton Vance, Eaton
       Vance Government  Obligations  Trust engages EVD to distribute the Fund's
       shares on a "best  efforts"  basis  through  Authorized  Firms.  EVD will
       furnish  the  names of  Authorized  Firms to an  investor  upon  request.
       Authorized Firms include  financial service firms with whom the Principal
       Underwriter has agreements.

     * PURCHASES BY WIRE. Investors may also purchase shares by requesting their
       bank to transmit immediately  available funds (Federal Funds) by wire to:
       ABA  #011001438,  Federal  Reserve Bank of Boston,  A/C Investors  Bank &
       Trust Company, Further Credit Eaton Vance Short-Term Treasury Fund, A/C #
       [Insert your account number -- see below].

            Upon making an initial  investment by wire, you must first telephone
       the Order Department of the Fund (800-225-6265, extension 3) to advise of
       your action and to be assigned an account number.  If you neglect to make
       the  telephone  call,  it may  not be  possible  to  process  your  order
       promptly.  In addition,  the Account  Application form which  accompanies
       this  Prospectus  should be  promptly  forwarded  to the The  Shareholder
       Services Group, Inc., BOS725, P.O. Box 1559, Boston, MA 02104.

            Additional  investments  may be made at any  time  through  the wire
       procedure  described above. The Fund Order Department must be immediately
       advised by telephone (800-225-6265,  extension 3) of each transmission of
       funds by wire.

            Purchases  received  by wire  before  noon on any  business  day are
       invested at the net asset  value  determined  at noon on that day.  Those
       received  by wire  between  noon and 4:00 P.M.  on any  business  day are
       invested at the net asset value determined at 4:00 P.M. the same day.

     * PURCHASES  BY  MAIL.  For  an  initial  purchase  by  mail,  the  Account
       Application form which  accompanies this Prospectus  should be completed,
       signed  and  mailed  with  a  check,  Federal  Reserve  Draft,  or  other
       negotiable bank draft,  drawn on a U.S. bank and payable in U.S. dollars,
       to the  order of  Eaton  Vance  Short-Term  Treasury  Fund to the  Fund's
       Transfer Agent as follows:  The Shareholder Services Group, Inc., BOS725,
       P.O. Box 1559, Boston, MA 02104.

            Additional  purchases  may be made at any time by  mailing  a check,
       Federal  Reserve Draft, or other  negotiable bank draft,  drawn on a U.S.
       bank and payable in U.S. dollars,  to the order of Eaton Vance Short-Term
       Treasury  Fund to the Fund's  Transfer  Agent at the above  address.  The
       account to which the  subsequent  purchase  is to be  credited  should be
       identified  as to the name(s) of the  registered  owner(s) and by account
       number.

     * OTHER PURCHASE PROCEDURES.  Transactions in the U.S. Treasury obligations
       in which the Fund invests require immediate  settlement in Federal Funds.
       The Fund  intends at all times to be as fully  invested as is feasible in
       order to maximize  its  earnings.  Accordingly,  purchase  orders will be
       executed at the net asset value next  determined  after their  receipt by
       the Fund  only if the Fund has  received  payment  in cash or in  Federal
       Funds. If remitted in other than the foregoing  manner,  such as by money
       order or personal check, purchase orders will be executed as of the close
       of business on the second Boston business day after receipt.  Information
       on how to procure a Federal Reserve Draft or to transmit Federal Funds by
       wire is available at your bank. The bank may charge for these services.

     In connection  with employee  benefit or other  continuous  group  purchase
plans under which the average  initial  purchase by a participant of the plan is
$5,000 or more, the Fund may accept  initial  investments of less than $5,000 on
the part of an  individual  participant.  In the  event a  shareholder  who is a
participant of such a plan terminates his  participation in the plan, his shares
will be transferred to a regular individual account.  However, such account will
be subject to the right of redemption by the Fund as described  below under "How
to Redeem or Sell Fund Shares."

HOW TO REDEEM OR SELL FUND SHARES

A SHAREHOLDER MAY REDEEM FUND SHARES BY DELIVERING TO THE  SHAREHOLDER  SERVICES
GROUP, INC., BOS725,  P.O. BOX 1559, BOSTON, MA 02104,  EITHER THE CERTIFICATES,
OR A STOCK  POWER,  if no  certificates  have  been  issued,  in good  order for
transfer, with a separate written request for redemption.  Payment will normally
be made by check within one business day after receipt of the redemption request
and must,  in any  event,  be made  within  seven days of such  receipt,  unless
expedited  payment has been  authorized and requested by the  shareholder.  (See
"Redemption by Wire" below). The redemption price will be based on the net asset
value next computed after such delivery.  Good order means that the certificates
or stock power must be endorsed by the record owner(s) exactly as the shares are
registered  and the  signature(s)  must be  guaranteed by a member of either the
Securities Transfer Association's STAMP program or the New York Stock Exchange's
Medallion  Signature Program,  or certain banks,  savings and loan institutions,
credit unions, securities dealers,  securities exchanges,  clearing agencies and
registered securities associations as required by a regulation of the Securities
and Exchange  Commission  (the  "Commission")  and acceptable to The Shareholder
Services  Group,  Inc. In  addition,  in some cases,  good order may require the
furnishing of additional  documents  such as where shares are  registered in the
name of a corporation, partnership or fiduciary.

    The right to redeem can be suspended and the payment of the redemption price
deferred  when the New York Stock  Exchange is closed  (other than for customary
weekend and holiday  closings),  during  periods when trading on the Exchange is
restricted  as  determined  by  the  Commission,  or  during  any  emergency  as
determined  by the  Commission  which  makes  it  impracticable  for the Fund to
dispose  of its  securities  or value its  assets,  or during  any other  period
permitted by order of the Commission for the protection of investors.

     * REDEMPTIONS BY WIRE. Shareholders who have given authorization in advance
       may request that redemption  proceeds of $1,000 or more be wired directly
       to their bank  account.  This request may  generally be made by letter or
       telephone  to the Fund Order  Department  at  800-225-6265,  extension 3.
       However,  shareholders  holding  certificates for shares in the Fund must
       return such certificates in properly endorsed form requesting  redemption
       prior to being  eligible to have  redemption  proceeds  wired directly to
       their bank account.

            To use this service a shareholder  must  designate his bank and bank
       account number on the Account  Application form used to open his account.
       The bank designated may be any bank in the United States.

            Proceeds of redemption requests received before noon on any business
       day will be wired  that same day,  if so  requested  by the  shareholder.
       Redemption requests received between noon and 4:00 p.m. will be processed
       at 4:00  p.m.  and the  redemption  proceeds  will be  wired  on the next
       business  day. The  shareholder  may be required to pay any costs of such
       transaction;  however, no such costs are currently charged. The Fund will
       limit  this  method of  payment to shares  purchased  with cash,  Federal
       Reserve Draft, by wire with Federal Funds, or by other means when payment
       for shares purchased has been assured. The Fund reserves the right at any
       time to suspend or terminate the expedited  payment  procedure;  however,
       the Fund would provide  reasonable  advance notice (in no event less than
       30 days) of its  intention to suspend or terminate  this  procedure.  The
       Fund will process  redemption  instructions  received by telephone if the
       shareholder  has authorized  telephone  redemptions  when  completing the
       Account Application form.  However,  the Fund will not process redemption
       requests  by  telephone  if share  certificates  have been issued to such
       shareholders.  The  responsibility  for the  authenticity  of  redemption
       instructions  received by  telephone  is  discussed  under  "Eaton  Vance
       Shareholder  Services -- Exchange  Privilege".  (See "How the Fund Values
       Its Shares").

     * REPURCHASE  THROUGH  AUTHORIZED  FIRMS. To sell shares at their net asset
       value through an Authorized Firm (a repurchase),  a shareholder can place
       a repurchase  order with the Firm,  who may charge a fee. Net asset value
       is  calculated  on the day the Firm  places  the order  with EVD,  as the
       Fund's  agent,  if the Firm  receives  the  order  prior to the  close of
       regular trading on the New York Stock Exchange and communicates it to EVD
       on the same day before EVD  closes.  It is the Firm's  responsibility  to
       promptly transmit repurchase orders to EVD.

     * REDEMPTIONS  BY CHECK.  To sell  shares by writing a check,  shareholders
       holding  shares for which  certificates  have not been issued may appoint
       Boston Safe Deposit and Trust Company ("Boston Safe") their agent and may
       request on the Account  Application  form that Boston Safe  provide  them
       with special  forms of checks  drawn on Boston Safe.  These checks may be
       made payable by the  shareholder to the order of any person in any amount
       of $500 or more.  When a check is  presented  to Boston Safe for payment,
       the number of full and fractional  shares required to cover the amount of
       the check will be redeemed from the shareholder's  account by Boston Safe
       as the shareholder's  agent.  Through this procedure the shareholder will
       continue  to be entitled  to  distributions  paid on his shares up to the
       time the check is presented to Boston Safe for payment.  If the amount of
       the  check  is  greater  than  the  value  of  the  shares  held  in  the
       shareholder's  account,  for which the Fund has  collected  payment,  the
       check  will be  returned  and the  shareholder  may be  subject  to extra
       charges.

            The shareholder will be required to execute signature cards and will
       be subject to Boston Safe's rules and regulations governing such checking
       accounts.  There is no  charge to  shareholders  for this  service.  This
       service may be  terminated or suspended at any time by the Fund or Boston
       Safe.

     OTHER REDEMPTION  PROCEDURES.  If shares were recently  purchased by check,
the  proceeds  of  redemption  or  repurchase  will not be sent  until the check
(including a certified or cashier's check) received for the shares purchased has
cleared.  Payment for shares tendered for redemption or repurchase may result in
a delay of more than seven days when the purchase check has not yet cleared, but
the delay (for up to fifteen days from the purchase date) will be no longer than
required  to verify that the  purchase  check has  cleared.  The value of shares
redeemed  or  repurchased  may be more or less  than  their  cost  depending  on
portfolio  performance  during  the  period  they were  owned.  Redemptions  and
repurchases  of shares are taxable  events on which  shareholders  may realize a
gain or a loss.

THE FUND IS AN OPEN-END MUTUAL FUND

EATON  VANCE  SHORT-TERM  TREASURY  FUND IS A SERIES OF EATON  VANCE  GOVERNMENT
OBLIGATIONS   TRUST  (THE   "TRUST"),   A  BUSINESS  TRUST   ESTABLISHED   UNDER
MASSACHUSETTS  LAW  PURSUANT TO A  DECLARATION  OF TRUST  DATED MAY 7, 1984,  AS
AMENDED.  THE  TRUST  IS A  MUTUAL  FUND -- AN  OPEN-END  MANAGEMENT  INVESTMENT
COMPANY.  The Trustees of the Trust are responsible  for the overall  management
and  supervision  of the  Fund's  affairs.  The Fund has one  class of shares of
beneficial  interest,  an  unlimited  number of which may be issued.  Each share
represents an equal  proportionate  beneficial interest in the Fund. When issued
and  outstanding,  the shares are fully paid and  nonassessable by the Trust and
redeemable as described under "How to Redeem or Sell Fund Shares".  Shareholders
are  entitled  to one vote for each full share  held.  Fractional  shares may be
voted  proportionately.  Shares have no preemptive or conversion  rights and are
freely transferable.  Upon liquidation of the Fund, shareholders are entitled to
share  pro rata in the net  assets of the Fund  available  for  distribution  to
shareholders.

     As permitted by  Massachusetts  law,  there will normally be no meetings of
shareholders for the purpose of electing  Trustees unless and until such time as
less than a  majority  of the  Trustees  holding  office  have been  elected  by
shareholders.  In  such  an  event  the  Trustees  then in  office  will  call a
shareholders'  meeting for the  election of Trustees.  Except for the  foregoing
circumstances  and unless  removed by action of the  shareholders  in accordance
with the Trust's  by-laws,  the Trustees  shall  continue to hold office and may
appoint successor Trustees.
   
     The by-laws provide that no person shall serve as a Trustee if shareholders
holding  two-thirds of the outstanding  shares have removed him from that office
either by a written  declaration  filed with the Trust's  custodian  or by votes
cast at a meeting  called for that  purpose.  The by-laws  further  provide that
under  certain  circumstances  the  shareholders  may call a meeting to remove a
Trustee and that the Trust is required to provide  assistance  in  communicating
with shareholders about such a meeting.

REPORTS TO SHAREHOLDERS

THE  FUND  WILL  ISSUE  TO  ITS  SHAREHOLDERS  SEMI-ANNUAL  AND  ANNUAL  REPORTS
CONTAINING FINANCIAL STATEMENTS. Financial statements included in annual reports
are audited by the Fund's independent accountants. Shortly after the end of each
calendar year, the Fund will furnish all shareholders with information necessary
for  preparing  Federal  and state  income tax  returns.

THE FUND'S  INVESTMENT ADVISER IS EATON VANCE

THE FUND  ENGAGES  EATON  VANCE  MANAGEMENT  ("EATON  VANCE") AS ITS  INVESTMENT
ADVISER.  EATON VANCE,  ITS AFFILIATES AND ITS  PREDECESSOR  COMPANIES HAVE BEEN
MANAGING  ASSETS  OF  INDIVIDUALS  AND  INSTITUTIONS  SINCE  1924  AND  MANAGING
INVESTMENT  COMPANIES SINCE 1931.  Eaton Vance's  expertise in the management of
fixed-income securities ranges from government obligations, high-grade corporate
and municipal securities and bank loan interests to higher yielding instruments.

     Eaton Vance,  acting under the general  supervision  of the Trustees of the
Trust, will carry out the investment and reinvestment of the assets of the Fund,
will furnish  continuously an investment  program with respect to the Fund, will
determine  which  securities  should be purchased,  sold or exchanged,  and will
implement such determinations.  Under its investment advisory agreement with the
Trust on behalf of the Fund,  Eaton Vance will  receive a monthly  advisory  fee
equal to the aggregate of
  
     (a) a daily asset based fee  computed  by  applying  the annual  asset rate
         applicable  to that  portion  of the  total  daily  net  assets in each
         Category as indicated below, plus

     (b) a daily  income  based fee  computed by applying  the daily income rate
         applicable  to that  portion of the total  daily  gross  income  (which
         portion  shall  bear the same  relationship  to the total  daily  gross
         income on such day as that portion of the total daily net assets in the
         same Category  bears to the total daily net assets on such day) in each
         Category as indicated below:
<TABLE>
<CAPTION>
                                                                                  ANNUAL            DAILY
     CATEGORY             DAILY NET ASSETS                                      ASSET RATE       INCOME RATE
     --------             ----------------                                      ----------       -----------
<S>      <C>       <C>                                                            <C>               <C>  
         1         up to $20 million ........................................     0.150%            1.50%
         2         $20 million but less than $40 million ....................     0.200%            2.00%
         3         $40 million but less than $500 million ...................     0.250%            2.50%
         4         $500 million but less than $1 billion ....................     0.225%            2.25%
         5         $1 billion but less than $1.5 billion ....................     0.200%            2.00%
         6         $1.5 billion but less than $2 billion ....................     0.190%            1.90%
         7         $2 billion but less than $3 billion ......................     0.180%            1.80%
         8         $3 billion and over ......................................     0.170%            1.70%

</TABLE>

Total daily gross income is the total  investment  income,  exclusive of capital
gains and losses and before deduction of expenses, earned each day by the Fund.

     As at December 31,  1993,  the Fund had net assets of  $1,743,411.  For the
fiscal year ended December 31, 1993, Eaton Vance would have earned, absent a fee
reduction,  advisory fees of $198,724 (equivalent to 0.27% of the Fund's average
net assets) for such period.  To enhance the net income of the Fund, Eaton Vance
made a reduction of its fee in the amount of $73,896.

     Eaton Vance also  furnishes  for the use of the Fund  office  space and all
necessary office facilities,  equipment and clerical  personnel,  and investment
advisory,  statistical  and  research  facilities  and has  arranged for certain
members of the Eaton Vance  organization  to serve without salary as officers or
Trustees  of the Trust.  The Fund is  responsible  for the payment of all of its
expenses  other than those  expressly  stated to be payable by Eaton Vance under
the Investment Advisory Agreement.

     Most of the obligations  which the Fund will acquire for its portfolio will
be normally traded on a net basis (without  commission)  through  broker-dealers
and banks acting for their own account.  Such firms  attempt to profit from such
transactions by buying at the bid price and selling at the higher asked price of
the market,  and the  difference is  customarily  referred to as the spread.  In
selecting  firms which will  execute  Fund  portfolio  transactions  Eaton Vance
judges  their  professional  ability  and  quality of service  and uses its best
efforts to obtain  execution at prices which are advantageous to the Fund and at
reasonably  competitive  spreads.  Subject  to the  foregoing,  Eaton  Vance may
consider sales of shares of the Fund or of other investment  companies sponsored
by Eaton  Vance as a  factor  in the  selection  of firms to  execute  portfolio
transactions.

     Michael B. Terry has acted as the Portfolio  Manager since  January,  1991.
Mr.  Terry has been a Vice  President  of Eaton Vance since 1984 and an employee
since 1984.

     EATON  VANCE OR ITS  AFFILIATES  ACT AS  INVESTMENT  ADVISER TO  INVESTMENT
COMPANIES AND VARIOUS  INDIVIDUAL  AND  INSTITUTIONAL  CLIENTS WITH ASSETS UNDER
MANAGEMENT  OF OVER $16 BILLION.  Eaton Vance is a  wholly-owned  subsidiary  of
Eaton Vance Corp.  ("EVC"), a holding company.  EVC through its subsidiaries and
affiliates, engages in investment management and marketing activities, fiduciary
and banking services, oil and gas operations, real estate investment, consulting
and management, and development of precious metals properties.

HOW THE FUND VALUES ITS SHARES

THE FUND  VALUES ITS SHARES  TWICE  EACH DAY THE NEW YORK  STOCK  EXCHANGE  (THE
"EXCHANGE") IS OPEN FOR TRADING,  AT NOON AND AS OF THE CLOSE OF REGULAR TRADING
ON THE EXCHANGE. The Fund's net asset value per share is determined by Investors
Bank & Trust Company (as agent for the Fund) ("IBT"),  in the manner  authorized
by the Trustees of the Trust.  Net asset value is computed by dividing the value
of the  Fund's  total  assets,  less its  liabilities,  by the  number of shares
outstanding.  Debt  securities  (other than short-term  obligations  maturing in
sixty days or less),  including listed securities and securities for which price
quotations  are  available,  will  normally  be  valued  on the  basis of market
valuations  furnished by a pricing  service.  Short-term  obligations  and money
market  securities  maturing in sixty days or less are valued at amortized cost,
which approximates  market.  Other assets are valued at fair value using methods
determined in good faith by the  Trustees.  The net asset value so determined is
effective  for  orders   received  by  Authorized   Firms  prior  to  the  price
determination  (which for this purpose shall be deemed to have been made at noon
and as of the  close of  regular  trading  on the New  York  Stock  Exchange  --
normally 4:00 p.m. New York time, except under extraordinary  circumstances) and
communicated  by the Authorized Firm to the Principal  Underwriter  (see "How to
Buy  Shares  of the  Fund")  at noon or  prior  to the  close  of the  Principal
Underwriter's  business  day.  It is the  Authorized  Firm's  responsibility  to
transmit  orders promptly to the Principal  Underwriter.  Eaton Vance Corp. owns
77.3% of the outstanding stock of IBT, the Fund's custodian.

THE  LIFETIME INVESTING ACCOUNT/DISTRIBUTION OPTIONS

AFTER AN INVESTOR MAKES AN INITIAL PURCHASE OF FUND SHARES,  THE FUND'S TRANSFER
AGENT, THE SHAREHOLDER  SERVICES GROUP,  INC., WILL SET UP A LIFETIME  INVESTING
ACCOUNT  FOR THE  INVESTOR  ON THE FUND'S  RECORDS.  This  account is a complete
record of all transactions  between the investor and the Fund which at all times
shows the balance of shares  owned.  The Fund will not issue share  certificates
except upon request. However, certificates may not be issued to shareholders who
have  authorized  redemption by telephone or who have  requested  redemptions by
check.

     Each  time a  transaction  takes  place  in a  shareholder's  account,  the
shareholder will receive a statement showing complete details of the transaction
and the current share balance in the account.  (Under certain  investment plans,
statements  may be sent only  quarterly).  The Lifetime  Investing  Account also
permits a shareholder to make additional  investments of $50 or more.  Inquiries
regarding a  shareholder's  account should identify the  shareholder's  name and
account number and be addressed in writing to The  Shareholder  Services  Group,
Inc., BOS725, P.O. Box 1559, Boston, MA 02104.

     Any questions concerning a shareholder's  account or services available may
be directed by telephone to Eaton Vance  Shareholder  Services at  800-225-6265,
extension 2.

     THE  FOLLOWING  DISTRIBUTION  OPTIONS  WILL BE  AVAILABLE  TO ALL  LIFETIME
INVESTING  ACCOUNTS and may be changed as often as desired by written  notice to
the Fund's dividend  disbursing  agent,  The Shareholder  Services Group,  Inc.,
BOS725,  P.O. Box 1559,  Boston,  MA 02104. The currently  effective option will
appear on each confirmation statement.

     Share Option -- Dividends  and capital  gains in  additional  shares.  This
option will be assigned if no other option is specified.

     Income Option -- Dividends in cash; capital gains in additional shares.

     Cash Option -- Dividends in cash; capital gains in cash.

     Under  the  Share  Option,   dividends  will  be  reinvested  (net  of  any
withholding  required  under the Federal income tax laws) on the payment date in
additional full and fractional shares at net asset value as of the record date.

     Under  Share and Income  Options,  all  distributions  from  capital  gains
(whether  long or  short-term)  will be paid in additional  full and  fractional
shares at the net asset value as of the record  date of each such  distribution,
net of any withholding required under the Federal income tax laws.

     If the Income  Option or Cash  Option has been  selected,  dividend  and/or
capital gains distribution checks which are returned by the United States Postal
Service as not  deliverable or which remain uncashed for six months or more will
be reinvested  in Fund shares at the then current net asset value.  Furthermore,
the  distribution  option on the account  will be  automatically  changed to the
Share Option until such time as the shareholder selects a different option.

     "STREET NAME" ACCOUNTS.  A beneficial  owner of shares who holds his shares
in a  "street  name"  account  at  an  investment  firm  is  reminded  that  all
recordkeeping,  transaction  processing  and  payments of  distributions  to his
account will be done by the firm holding the shares,  and not by the Fund or its
Transfer  Agent.  Year end forms  required for tax purposes  (1099-DIV,  1099-B,
etc.) are also provided by that investment firm. The Fund will have no record of
transactions for a beneficial owner of shares while shares held for him are in a
"street name" account. Requests for any such information regarding the shares or
the account should be directed to that investment firm.

     Transactions in a "street name" account will be reflected on the records of
the Fund only upon the  instructions  of the investment firm which is the record
owner of the shares.  A beneficial  owner of shares in a "street  name"  account
should contact his  investment  firm  representative  if he wants to purchase or
redeem  shares or make other  changes in his  account.  A transfer  of a "street
name" account at one investment  firm to a "street name" account at another firm
may require  approval by the transferee  firm.  There are no fees charged by the
Fund for an account transfer, but transfer fees may be charged by the investment
firms.

     If a  beneficial  owner  wishes to  transfer  shares  from a "street  name"
account to another  firm's "street name"  account,  he should  instruct the firm
currently  holding the "street name" account to provide  information  concerning
the costs and  purchase  dates of all shares  purchased  in the  account and the
number of shares acquired through reinvestment of distributions and remaining in
the account to the transferee  firm in a form  satisfactory  to the Fund. If the
transfer  is to an  account  to be  registered  in the name of the  owner on the
records of the Fund, this  information  must be furnished to the Fund's Transfer
Agent in a form  satisfactory to the Fund. The furnishing of this information is
esential to provide an historical investment record of all shares owned.

     Before  establishing  a "street name"  account with an investment  firm, or
transfering  the account to another  investment  firm,  an  investor  wishing to
reinvest  distributions  should  determine  whether the firm which will hold the
shares allows reinvestment of distributions in "street name" accounts.

EATON VANCE SHAREHOLDER SERVICES

THE FOLLOWING  SERVICES,  ARE  VOLUNTARY,  INVOLVE NO EXTRA  CHARGE,  AND MAY BE
CHANGED OR DISCONTINUED WITHOUT PENALTY AT ANY TIME. Full information on each of
the services  described below and an application,  where required,  is available
from Authorized  Firms or the Principal  Underwriter.  The cost of administering
such services for the benefit of  shareholders  who participate in them is borne
by the Fund as an expense to all  shareholders.

INVEST-BY-MAIL  -- FOR  PERIODIC  SHARE  ACCUMULATION:  Once the $5,000  minimum
investment  has been made,  checks of $50 or more  payable to the order of Eaton
Vance  Short-Term  Treasury  Fund  may be  mailed  directly  to The  Shareholder
Services Group,  Inc.,  BOS725,  P.O. Box 1559,  Boston, MA 02104 at any time --
whether or not dividends are reinvested.  The name of the  shareholder,  and his
account number should accompany each investment.

EXCHANGE  PRIVILEGE:  You may currently  exchange your Fund shares for shares of
Eaton Vance Cash  Management  Fund at net asset value.  An exchange must involve
shares with an aggregate net asset value of $5,000 or more.  The  prospectus for
Eaton  Vance Cash  Management  Fund  describes  its  investment  objectives  and
policies,  and  shareholders  should  obtain a  prospectus  and  consider  these
objectives and policies  carefully before  requesting an exchange.  The exchange
privilege may be changed of discontinued  without penalty.  Shareholders will be
given sixty (60) days notice prior to any  termination or material  amendment of
the exchange  privilege.  This offer is available only in states where shares of
Cash Management Fund may be legally sold.

     The  Shareholder   Services  Group,   Inc.  makes  exchanges  at  the  next
determination  of net asset value after  receiving  an exchange  request in good
order (see "How to Redeem or Sell Fund Shares"). The Shareholder Services Group,
Inc. will require additional  documentation if shares are registered in the name
of a corporation,  partnership or fiduciary.  Consult The  Shareholder  Services
Group, Inc. for additional information concerning the exchange privilege.

     Telephone  exchanges are also accepted if the exchange  involves  shares on
deposit  with The  Shareholder  Services  Group,  Inc.  and the investor has not
disclaimed in writing the use of the privilege.  To effect such exchanges,  call
The Shareholder  Services Group, Inc. at 800-262-1122 or, within  Massachusetts,
617-573-9403,  Monday through Friday,  9:00 a.m. to 4:00 p.m.  (Eastern Standard
Time).  All such telephone  exchanges must be registered in the same name(s) and
with the same address as are registered with Eaton Vance Cash  Management  Fund.
Neither the Fund, the Principal  Underwriter nor The Shareholder Services Group,
Inc. will be responsible for the authenticity of exchange  instructions received
by telephone;  provided that reasonable  procedures to confirm that instructions
communicated are genuine have been followed. Telephone instructions will be tape
recorded.  In times of drastic economic or market changes,  a telephone exchange
may be difficult to implement.

     For Federal and state income tax purposes,  an exchange is a sale which may
result in  realization  of a gain or loss,  depending  on the cost of the shares
which  you  exchange.  Tax-Sheltered  Retirement  Plans:  Shares of the Fund are
available for purchase in connection with the following tax-sheltered retirement
plans:

     --Pension  and  Profit   Sharing  Plans  for   self-employed   individuals,
       corporations and non-profit organization;

     --Individual  Retirement  Account  Plans for  individuals  and  their  non-
       employed spouses.

     --403(b)   Retirement   Plans  for  employees  of  public  school  systems,
       hospitals,  colleges and other non-profit  organizations  meeting certain
       requirements of the Internal Revenue Code.

     Detailed information  concerning these plans,  including certain exceptions
to minimum investment  requirements,  and copies of the plans are available from
the  Principal  Underwriter.  This  information  should  be read  carefully  and
consultation  with an attorney or tax adviser may be advisable.  The information
sets forth the  service  fee  charged for  retirement  plans and  describes  the
Federal income tax  consequences of establishing a plan.  Under these plans, all
distributions will be automatically reinvested in additional shares.

DISTRIBUTION PLAN

In  addition  to  advisory  fees and other  expenses,  the Fund pays for certain
expenses  pursuant  to a  Distribution  Plan (the  "Plan")  designed to meet the
requirements  of Rule 12b-1 under the  Investment  Company Act of 1940. The Plan
provides  that  the  Fund  will  pay  the  Principal   Underwriter  a  quarterly
distribution  fee equal to .25% on an annual basis of the Fund's  average  daily
net assets.  The  Principal  Underwriter  may pay up to the entire amount of the
distribution fee to Authorized Firms (including banking  institutions) and their
employees and to employees of the Principal  Underwriter  and its affiliates for
providing  distribution  services to the Fund or services to  shareholders.  The
Principal  Underwriter may also pay all or a portion of such distribution fee to
employees of the Principal  Underwriter  or any of its  affiliates for providing
any of such  services.  During the fiscal year ended December 31, 1993, the Fund
paid  $181,641  in  distribution  fees  to the  Principal  Underwriter  and  the
Principal  Underwriter in turn paid $172,117 of this amount to Authorized  Firms
or  others  as  described  above and used the  balance  of $9,524 to  compensate
employees of the Principal  Underwriter and its affiliates and to defray part of
its expenses associated with distributing shares of the Fund.

     To the extent that the distribution fee is not paid to such Firms and other
persons,  the  Principal  Underwriter  may use  such  fee for  its  expenses  of
distribution  of Fund shares.  If such fees exceed its  expenses,  the Principal
Underwriter will realize a profit from these arrangements.

     Rule 12b-1 is broadly worded and currently  permits  mutual funds,  such as
the Fund, to finance  distribution  activities and bear expenses associated with
the distribution of their shares. While the Rule does not describe in detail the
specific  types of  activities  which may be financed  or expenses  which may be
borne by a fund, it currently  states that such permissible  activities  include
the compensation of underwriters,  dealers and sales personnel. Accordingly, the
Distribution  Plan adopted by the Fund is designed to  compensate  the Principal
Underwriter  and the  Authorized  Firms  through  which the  Fund's  shares  are
distributed.

PERFORMANCE AND YIELD  INFORMATION

From time to time,  the Fund may advertise its yield and/or average annual total
return. The yield for the Fund will be calculated by dividing the net investment
income per share during a recent 30-day period by the maximum offering price per
share  (net  asset  value)  of the  Fund  on the  last  day  of the  period  and
annualizing the resulting figure.  Yield should not be considered the equivalent
of dividends.  The Fund's average annual total return is determined by computing
the average annual  percentage change in value of $1,000 invested at the maximum
public  offering  price (net asset value) for specified  periods ending with the
most recent calendar quarter,  assuming  reinvestment of all distributions.  The
total return calculation  assumes a complete  redemption of the investment.  The
Fund may also publish  annual and  cumulative  total return figures from time to
time.

    The  investment  results  of the Fund  will  fluctuate  over  time,  and any
presentation of the Fund's yield or total return for any prior period should not
be considered  as a  representation  of what an  investment  may earn or what an
investor's yield or total return may be in any future period.

BACKUP WITHHOLDING

PROCEEDS OF VARIOUS DISTRIBUTIONS

     It is required under Federal income tax laws that taxable distributions and
proceeds of  redemptions  and  exchanges  be reported  to the  Internal  Revenue
Service  ("IRS").  It is also  required  that 31% of taxable  distributions  and
certain proceeds of redemption  requests  received directly from shareholders be
withheld if (i) a correct and certified Taxpayer  Identification Number (TIN) is
not provided for your  account,  (ii) you fail to certify that you have not been
notified by the IRS that you underreported taxable interest or dividend payments
of (iii) the Fund is notified by the IRS (or a broker)  that the TIN provided is
incorrect or you are otherwise subject to backup  withholding.  Amounts withheld
and  forwarded  to the IRS can be credited  as a payment of tax when  completing
your Federal income tax return.

     For most individual  taxpayers,  the TIN is the social security number.  An
investor  may  furnish  the  Transfer  Agent with such  number and the  required
certifications by completing and sending to the Transfer Agent either the Fund's
Account  Application  form which  accompanies  this  prospectus or IRS Form W-9.
Special  rules  apply  for  certain  accounts.   For  example,  for  an  account
established under the Uniform Gift to Minors Act, the TIN of the minor should be
furnished.

TO APPLY FOR A TIN

    If you do not have a TIN or do not know your  number,  you may apply for one
using  Form  SS-5,  "Application  for a  Social  Security  Card"  or Form  SS-4,
"Application for Employer  Identification  Number." These forms are available at
local offices of the Social Security  Administration or the IRS. We will forward
a  certification  form to you which you should use to notify us of your  number.
Withholding  may apply to payments  made to your account  before we receive your
certified number.

EXEMPT RECIPIENTS AND FOREIGN PAYEES

    Exempt recipients should provide their TIN and underline section 2(a) in the
TIN  section on the  application  to avoid  possible  erroneous  withholding.  A
partial listing of exempt classes of investors follows: Corporations,  financial
institutions,  IRAs, the U.S.  Government,  a State or possession of the U.S., a
foreign government, international organizations, and 501(a) exempt entities such
as colleges,  churches and charitable  organizations.  If you are a non-resident
alien,  check the appropriate box on the  application.  Non-resident  aliens and
foreign entities may be subject to non-resident  alien  withholding of up to 30%
(instead of backup  withholding of 31%) on certain  distributions  received from
the Fund and will be required to provide certain  certifications on IRS Form W-8
to avoid 31% backup  withholding  with  respect to other  payments.  For further
information,  see Code  Sections  1441,  1442 and 3406 and/ or consult  your tax
adviser.


<PAGE>
INVESTMENT ADVISER
Eaton Vance Management
24 Federal Street
Boston, MA 02110

PRINCIPAL UNDERWRITER
Eaton Vance Distributors, Inc.
24 Federal Street
Boston, MA 02110
(800) 225-6265

CUSTODIAN
Investors Bank & Trust Company
24 Federal Street
Boston, MA 02110

TRANSFER AGENT
The Shareholder Services Group, Inc.
BOS725
P.O. Box 1559
Boston, MA 02104
(800) 262-1122

INDEPENDENT ACCOUNTANTS
Coopers & Lybrand
One Post Office Square
Boston, MA 02109

EATON VANCE SHORT-TERM TREASURY FUND
24 FEDERAL STREET
BOSTON, MA 02110

TYP

EATON VANCE
SHORT-TERM
TREASURY FUND

PROSPECTUS

MAY 1, 1994




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