DREYFUS ONE HUNDRED PERCENT US TREASURY LONG TERM FUND
N-30D, 2000-03-07
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Dreyfus
U.S. Treasury
Long Term Fund

ANNUAL REPORT December 31, 1999

(reg.tm)





The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

   * Not FDIC-Insured
   * Not Bank-Guaranteed
   * May Lose Value

Year 2000 Issues (Unaudited)

The fund could be adversely affected if the computer systems used by Dreyfus and
the fund's other service providers do not properly process and calculate
date-related information from and after January 1, 2000. Dreyfus has taken steps
designed to avoid year 2000-related problems in its systems and to monitor the
readiness  of other service providers.  In addition, issuers of securities in
which the fund invests may be adversely affected by year 2000-related problems.
This could have an impact on the value of the fund's investments and its share
price.


                                 Contents

                                 THE FUND
- --------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Fund Performance

                             7   Statement of Investments

                             8   Statement of Financial Futures

                             9   Statement of Assets and Liabilities

                            10   Statement of Operations

                            11   Statement of Changes in Net Assets

                            12   Financial Highlights

                            13   Notes to Financial Statements

                            18   Report of Independent Auditors

                            19   Important Tax Information

                                 FOR MORE INFORMATION
- ---------------------------------------------------------------------------

                                 Back Cover

                                                                       The Fund

                                                          Dreyfus U.S. Treasury
                                                                 Long Term Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We are pleased to present this annual report for Dreyfus U.S. Treasury Long Term
Fund,  covering  the  12-month  period from January 1, 1999 through December 31,
1999.  Inside,  you' ll find valuable information about how the fund was managed
during  the  reporting  period,  including  a  discussion with Gerald Thunelius,
portfolio manager and a member of the Dreyfus Taxable Fixed Income Team.

The  past  year  was  challenging  for  most fixed-income investors. Faster than
expected  economic  growth  in  the  U.S.  and  overseas  fueled  concerns  that
long-dormant  inflationary  pressures  might re-emerge, potentially reducing the
future  value of bonds' interest and principal payments. These concerns prompted
the  Federal  Reserve  Board  to raise key short-term interest rates three times
during  the summer and fall of 1999 in an attempt to prevent a reacceleration of
inflation.

While  U.S.  Treasury and agency securities declined sharply in this environment
during 1999, prices of higher yielding securities -- such as corporate bonds and
mortgage-backed  securities  --  fell less severely. In an environment of robust
economic  growth,  investors  appeared  more  comfortable  owning bonds that are
influenced  primarily  by credit risk, and they avoided securities that are most
affected by interest-rate risk.

We  appreciate  your  confidence over the past year, and we look forward to your
continued   participation   in   Dreyfus   U.S.   Treasury   Long   Term  Fund.

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
January 14, 2000




DISCUSSION OF FUND PERFORMANCE

Gerald Thunelius, Portfolio Manager Dreyfus Taxable Fixed Income Team

How did Dreyfus U.S. Treasury Long Term Fund  perform relative to its benchmark

For the 12-month period ended December 31, 1999, Dreyfus U.S. Treasury Long Term
Fund  produced  a  total return of -8.14%.(1) In contrast, the fund's benchmark,
the  Merrill  Lynch  Governments,  U.S.  Treasury, Long-Term (10 Years and Over)
Index,  provided a -8.61% total return.(2) The fund's income dividends paid from
net  investment  income  during  the period amounted to approximately $0.817 per
share, representing a distribution rate per share of 5.83%.(3)

We  attribute  the  fund' s  performance  to  rising interest rates and a highly
volatile bond market. Long-term bonds are particularly vulnerable to the eroding
effects  of  higher  interest rates. The U.S. Treasury sector of the bond market
was  particularly  hard-hit  in 1999 because of a dramatic fall-off in demand as
investors  sold  U.S.  Treasuries  in favor of higher yielding bonds. To a large
extent,  these  sales  represented  the "unwinding" of large U.S. Treasury funds
that  were  amassed  by  foreign  and  domestic  investors  during 1998's global
financial crisis.

What is the fund's investment approach?

As a U.S. Treasury fund, our goal is to provide shareholders with current income
through an investment vehicle that is composed primarily of U.S. Treasury bills,
notes  and  other  securities that are issued or guaranteed by the United States
government,  its  agencies  or  instrumentalities.  The  fund may also invest in
options and futures and enter into repurchase agreements with securities dealers
that are backed by U.S. Treasuries.

Because U.S. Treasury bills and notes are backed by the full faith and credit of
the  U.S.  government,  they  are generally considered to rank among the highest
credit  quality  investments  available.  By investing in these obligations, the
fund seeks to maintain a high degree of credit

                                                                       The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

safety.  Of  course,  the market value of the fund's securities and the value of
fund  shares  are  not  insured  or  guaranteed by the U.S. government. The fund
generally maintains an average dollar-weighted portfolio that exceeds 10 years.

What other factors influenced the fund's performance?

Like  virtually all fixed-income investments, long-term U.S. Treasury securities
were adversely affected by rising interest rates throughout the year.

Soon  after  the  reporting  period  began,  it  became  apparent  that overseas
economies  were  beginning  to  recover from 1998's global financial crisis, and
that the growth of the U.S. economy was stronger than most analysts expected. In
this  environment, investors began to move away from U.S. Treasury securities to
which  they had previously fled during the worst of the global financial crisis.
They  moved instead into higher yielding, riskier assets. This caused the prices
of  U.S.  Treasury  securities  to  fall  from relatively high levels, while the
prices   of   corporate   bonds,  mortgage-backed  securities  and  asset-backed
securities rallied.

In the second through fourth quarters of 1999, economic strength in domestic and
overseas   markets  raised  concerns  among  U.S.  fixed-income  investors  that
inflationary  pressures  might re-emerge. In response, the Federal Reserve Board
increased  short-term  interest  rates three times during the summer and fall of
1999  in an attempt to forestall a reacceleration of inflation. These changes in
monetary  policy  caused  the  prices  of  most  bonds,  including U.S. Treasury
securities, to fall.

U.S.  Treasury  securities generally fell more severely than prices of corporate
bonds  and other higher yielding fixed-income investments during the second half
of  the year. That's primarily because corporate bonds tend to be more sensitive
to  the  credit  quality  of their issuers, which generally improves in a strong
economy,   and  are  less  sensitive  to  interest-rate  trends;  U.S.  Treasury
securities are more sensitive to interest-rate changes.


What is the fund's current strategy?

Our current strategy is an extension of the strategy we have attempted to follow
for  much  of 1999, which is intended to earn as much yield as possible from our
holdings,  while  positioning  the fund to respond favorably when more favorable
economic  and  market  conditions arrive. Toward that end, we have increased the
fund' s  exposure  to  off-the-run  (" OTR") Treasuries, which are U.S. Treasury
securities  that  were  issued  prior  to  the  most recent auction process. The
benefit  of  owning  OTR  Treasuries  is that they tend to produce higher yields
because they are often considered less liquid than recent issues. Although these
holdings  hindered  the  fund' s  returns as interest rates rose in 1999, we are
hopeful  that  they  will  rally more strongly than other types of U.S. Treasury
securities if and when the bond market experiences a positive recovery.

While  in  our  view no one can predict the timing for a bond market recovery or
lower  interest  rates, we believe that current financial conditions may be ripe
for  such a recovery. Most important, we believe that the federal budget surplus
may  cause  the  U.S.  Treasury to buy back some of its outstanding debt. If the
government  buys back older, higher yielding securities first, as we would like,
the fund's OTR Treasury holdings should benefit accordingly.

January 14, 2000

(1)  TOTAL RETURN INCLUDES REINVESTMENT OF DIVIDENDS AND ANY CAPITAL GAINS PAID.
PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. SHARE PRICE, YIELD AND
INVESTMENT RETURN FLUCTUATE SUCH THAT UPON REDEMPTION, FUND SHARES MAY BE WORTH
MORE OR LESS THAN THEIR ORIGINAL COST. PERFORMANCE FIGURES PROVIDED REFLECT THE
ABSORPTION OF FUND EXPENSES BY THE DREYFUS CORPORATION PURSUANT TO AN
UNDERTAKING IN EFFECT THAT MAY BE EXTENDED, TERMINATED OR MODIFIED AT ANY TIME.
HAD THESE EXPENSES NOT BEEN ABSORBED, THE FUND'S PERFORMANCE WOULD HAVE BEEN
LOWER.

(2)  SOURCE: BLOOMBERG L.P. -- THE MERRILL LYNCH GOVERNMENTS, U.S. TREASURY,
LONG-TERM (10 YEARS AND OVER) INDEX IS AN UNMANAGED PERFORMANCE BENCHMARK FOR
TREASURY SECURITIES WITH MATURITIES OF 10 YEARS AND OVER; ISSUES IN THE INDEX
MUST HAVE PAR AMOUNTS OUTSTANDING GREATER THAN OR EQUAL TO $1 BILLION.

(3)  DISTRIBUTION RATE PER SHARE IS BASED UPON DIVIDENDS PER SHARE PAID FROM NET
INVESTMENT INCOME DURING THE PERIOD, DIVIDED BY THE NET ASSET VALUE PER SHARE AT
THE END OF THE PERIOD.

                                                             The Fund

FUND PERFORMANCE

Comparison of change in value of $10,000 investment in Dreyfus U.S. Treasury
Long Term Fund and the Merrill Lynch Governments, U.S. Treasury, Long-Term (10
Years and Over) Index
- --------------------------------------------------------------------------------

Average Annual Total Returns AS OF 12/31/99
<TABLE>


                                                                               1 Year             5 Years          10 Years
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                            <C>                 <C>               <C>

FUND                                                                           (8.14)%             7.44%             7.52%
</TABLE>


(+)  SOURCE: BLOOMBERG L.P.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

THE ABOVE GRAPH COMPARES A $10,000 INVESTMENT MADE IN DREYFUS U.S. TREASURY LONG
TERM FUND ON 12/31/89 TO A $10,000 INVESTMENT MADE IN THE MERRILL LYNCH
GOVERNMENTS, U.S. TREASURY, LONG-TERM (10 YEARS AND OVER) INDEX ON THAT DATE.
ALL DIVIDENDS AND CAPITAL GAIN DISTRIBUTIONS ARE REINVESTED.

THE FUND INVESTS AT LEAST 65% OF ITS NET ASSETS IN U.S. TREASURY SECURITIES. THE
FUND'S PORTFOLIO WILL, UNDER NORMAL MARKET CONDITIONS, HAVE A DOLLAR-WEIGHTED
AVERAGE MATURITY OF GREATER THAN 10 YEARS. THE FUND'S PERFORMANCE SHOWN IN THE
LINE GRAPH TAKES INTO ACCOUNT FEES AND EXPENSES. UNLIKE THE FUND, THE MERRILL
LYNCH GOVERNMENTS, U.S. TREASURY, LONG-TERM (10 YEARS AND OVER) INDEX IS AN
UNMANAGED PERFORMANCE BENCHMARK FOR TREASURY SECURITIES WITH MATURITIES OF 10
YEARS AND OVER; ISSUES IN THE INDEX MUST HAVE PAR AMOUNTS OUTSTANDING GREATER
THAN OR EQUAL TO $1 BILLION. THE INDEX DOES NOT TAKE INTO ACCOUNT CHARGES, FEES
AND OTHER EXPENSES. FURTHER INFORMATION RELATING TO FUND PERFORMANCE, INCLUDING
EXPENSE REIMBURSEMENTS, IF APPLICABLE, IS CONTAINED IN THE FINANCIAL HIGHLIGHTS
SECTION OF THE PROSPECTUS AND ELSEWHERE IN THIS REPORT.




STATEMENT OF INVESTMENTS
<TABLE>

December 31, 1999

                                                                                            Principal
BONDS AND NOTES--96.3%                                                                      Amount ($)                Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                          <C>                       <C>

U.S. GOVERNMENT AGENCIES--25.2%

Federal Home Loan Banks,

   Medium-Term Notes, 6.005%, 7/28/2028                                                      24,000,000               20,646,000

Tennessee Valley Authority,

  Valley Indexed Principal Securities,

   3.375%, 1/15/2007                                                                          5,000,000  (a)           4,842,210

U.S. Government Gtd. Development,

  Participation Ctfs.

  (Gtd. By U.S. Small Business Administration):

      Ser. 1998-20, Cl. E, 6.3%, 5/1/2018                                                       938,368                  881,071

      Ser. 1998-20, Cl. J, 5.5%, 10/1/2018                                                    1,729,467                1,538,607

      Ser. 1998-20, Cl. L, 5.8%, 12/1/2018                                                    2,869,955                2,600,408

                                                                                                                      30,508,296

U.S. TREASURY BONDS--40.1%

   8.5%, 2/15/2020                                                                           28,300,000               33,458,524

   8.75%, 5/15/2017                                                                           2,750,000                3,284,958

   9.125%, 5/15/2018                                                                          3,000,000                3,717,570

   10.625%, 8/15/2015                                                                         6,000,000                8,171,940

                                                                                                                      48,632,992

U.S. TREASURY INFLATION PROTECTION SECURITIES--9.7%

   3.625%, 1/15/2008                                                                         10,000,000  (a)           9,920,400

   3.875%, 4/15/2029                                                                          2,000,000  (a)           1,868,560

                                                                                                                      11,788,960

U.S. TREASURY NOTES--10.9%

   4.75%, 11/15/2008                                                                         15,000,000               13,241,550

U.S. TREASURY PRINCIPAL STRIPS--10.4%

   Zero Coupon, 11/15/2009                                                                   25,000,000               12,643,500

TOTAL BONDS AND NOTES

   (cost $120,807,404)                                                                                               116,815,298
- ------------------------------------------------------------------------------------------------------------------------------------

SHORT-TERM INVESTMENTS--2.4%
- ------------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY BILLS:

   5.19%, 1/13/2000                                                                           2,055,000  (b)           2,052,349

   4.96%, 3/30/2000                                                                             925,000                  913,465

TOTAL SHORT-TERM INVESTMENTS

   (cost $2,965,102)                                                                                                   2,965,814
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $123,772,506)                                                             98.7%              119,781,112

CASH AND RECEIVABLES (NET)                                                                         1.3%                1,516,756

NET ASSETS                                                                                       100.0%              121,297,868

(A)  PRINCIPAL AMOUNT FOR ACCRUAL PURPOSES IS PERIODICALLY ADJUSTED BASED ON
     CHANGES TO THE CONSUMER PRICE INDEX.

(B)  PARTIALLY HELD BY THE CUSTODIAN IN A SEGREGATED ACCOUNT AS COLLATERAL FOR
     OPEN FINANCIAL FUTURES POSITIONS.
</TABLE>

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF FINANCIAL FUTURES

December 31, 1999

<TABLE>

                                                                   Market Value                                         Unrealized
                                                                     Covered by                                      (Depreciation)
                                            Contracts              Contracts ($)            Expiration              at 12/31/99 ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>                   <C>                  <C>                           <C>

FINANCIAL FUTURES LONG

U.S. Treasury 10 Year Notes                        29                  2,779,922            March 2000                     (39,875)

U.S. Treasury 30 Year Bonds                       177                 16,095,937            March 2000                     (47,813)

                                                                                                                           (87,688)
</TABLE>


SEE NOTES TO FINANCIAL STATEMENTS.


STATEMENT OF ASSETS AND LIABILITIES

December 31, 1999

                                                             Cost         Value
- --------------------------------------------------------------------------------

ASSETS ($):

Investments in securities--See Statement of
Investments                                           123,772,506    119,781,112

Receivable for shares of Beneficial Interest subscribed                  66,293

Interest receivable                                                   2,242,751

Prepaid expenses and other assets                                         2,441

                                                                     122,092,597
- --------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                            54,856

Cash overdraft due to Custodian                                          59,323

Payable for shares of Beneficial Interest redeemed                      575,024

Payable for futures variation margin--Note 4(a)                          68,281

Accrued expenses                                                         37,245

                                                                        794,729
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      121,297,868
- --------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     143,666,079

Accumulated net realized gain (loss) on investments and
   financial futures                                                (18,289,129)

Accumulated net unrealized appreciation (depreciation)

  on investments [including ($87,688) net unrealized

   (depreciation) on financial futures]--Note 4(b)                   (4,079,082)
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      121,297,868
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares of
   Beneficial Interest authorized)                                    8,655,361

NET ASSET VALUE, offering and redemption price per share ($)              14.01

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

STATEMENT OF OPERATIONS

Year Ended December 31, 1999

- --------------------------------------------------------------------------------

INVESTMENT INCOME ($):

INTEREST INCOME                                                      8,202,662

EXPENSES:

Management fee--Note 3(a)                                              787,531

Shareholder servicing costs--Note 3(b)                                 409,494

Professional fees                                                       41,780

Trustees' fees and expenses--Note 3(c)                                  34,822

Registration fees                                                       31,585

Custodian fees--Note 3(b)                                               17,850

Prospectus and shareholders' reports                                    14,618

Loan commitment fees--Note 2                                             1,163

Miscellaneous                                                            4,917

TOTAL EXPENSES                                                       1,343,760

Less--reduction in management fee due to

   undertaking--Note 3(a)                                             (291,838)

NET EXPENSES                                                         1,051,922

INVESTMENT INCOME--NET                                               7,150,740
- --------------------------------------------------------------------------------

REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 4 ($):

Net realized gain (loss) on investments and options written        (12,002,846)

Net realized gain (loss) on financial futures                      (2,773,950)

NET REALIZED GAIN (LOSS)                                           (14,776,796)

Net unrealized appreciation (depreciation) on investments

   [including ($87,688) net unrealized (depreciation) on financial futures]

                                                                    (3,456,099)

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS             (18,232,895)

NET (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS              (11,082,155)

SEE NOTES TO FINANCIAL STATEMENTS.


STATEMENT OF CHANGES IN NET ASSETS

                                                        Year Ended December 31,
                                                    ----------------------------
                                                     1999                1998
- --------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          7,150,740            6,997,579

Net realized gain (loss) on investments      (14,776,796)           11,171,370

Net unrealized appreciation (depreciation)
   on investments                             (3,456,099)           (4,493,318)

NET INCREASE (DECREASE) IN NET ASSETS
   RESULTING FROM OPERATIONS                 (11,082,155)            13,675,631
- --------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (7,150,740)          (6,997,579)
- --------------------------------------------------------------------------------

BENEFICIAL INTEREST TRANSACTIONS ($):

Net proceeds from shares sold                 119,178,620           87,599,125

Dividends reinvested                            4,516,859            4,275,403

Cost of shares redeemed                     (126,050,055)          (91,359,590)

INCREASE (DECREASE) IN NET ASSETS FROM
   BENEFICIAL INTEREST TRANSACTIONS           (2,354,576)              514,938

TOTAL INCREASE (DECREASE) IN NET ASSETS      (20,587,471)            7,192,990
- --------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                           141,885,339          134,692,349

END OF PERIOD                                 121,297,868          141,885,339
- --------------------------------------------------------------------------------

CAPITAL SHARE TRANSACTIONS (SHARES):

Shares sold                                     7,900,927            5,530,831

Shares issued for dividends reinvested            303,591              272,160

Shares redeemed                               (8,358,173)           (5,799,835)

NET INCREASE (DECREASE) IN SHARES OUTSTANDING   (153,655)                3,156

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund

FINANCIAL HIGHLIGHTS

The  following table describes the performance for the fiscal periods indicated.
Total return shows how much your investment in the fund would have increased (or
decreased)  during  each  period,  assuming you had reinvested all dividends and
distributions.  These  figures  have  been  derived  from  the  fund's financial
statements.

<TABLE>

                                                                                        Year Ended December 31,
                                                                 -------------------------------------------------------------------
                                                                 1999           1998          1997          1996           1995
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                             <C>            <C>            <C>           <C>           <C>

PER SHARE DATA ($):

Net asset value, beginning of period                            16.11          15.30         14.61          15.51         13.26

Investment Operations:

Investment income--net                                            .82            .80           .93            .98           .96

Net realized and unrealized

   gain (loss) on investments                                   (2.10)           .81           .69           (.89)         2.25

Total from Investment Operations                                (1.28)          1.61          1.62            .09          3.21

Distributions:

Dividends from investment income--net                            (.82)          (.80)         (.93)          (.99)         (.96)

Net asset value, end of period                                  14.01          16.11         15.30          14.61         15.51
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                                (8.14)         10.77         11.69            .87         24.91
- ------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to average net assets                           .80            .80           .80            .80           .87

Ratio of net investment income

   to average net assets                                         5.45           5.10          6.48           6.74          6.69

Decrease reflected in above expense ratios

   due to undertakings by
   The Dreyfus Corporation                                        .22            .21           .24            .19           .05

Portfolio Turnover Rate                                        495.51        1,181.48       905.99         765.13        634.38
- ------------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period ($ x 1,000)                         121,298         141,885      134,692        135,368       146,445

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>


NOTES TO FINANCIAL STATEMENTS

NOTE 1--Significant Accounting Policies:

Dreyfus  U.S.  Treasury  Long  Term  Fund  (the  "fund") is registered under the
Investment  Company  Act  of  1940,  as  amended  (the  "Act"), as a diversified
open-end  management  investment  company. The fund's investment objective is to
provide  investors  with as high a level of current income as is consistent with
the  preservation  of capital. The Dreyfus Corporation (the "Manager") serves as
the  fund' s  investment  adviser.  The Manager is a direct subsidiary of Mellon
Bank,  N.A.  (" Mellon"), which is a wholly-owned subsidiary of Mellon Financial
Corporation. Premier Mutual Fund Services, Inc. is the distributor of the fund's
shares, which are sold to the public without a sales charge.

The  fund' s  financial  statements  are  prepared  in accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions. Actual results could differ from those estimates.

(A)   PORTFOLIO  VALUATION:  Investments  in  securities  (excluding  short-term
investments  other  than  U.S.  Treasury Bills and financial futures) are valued
each  business day by an independent pricing service ("Service") approved by the
Board of Trustees. Investments for which quoted bid prices are readily available
and  are  representative  of  the  bid side of the market in the judgment of the
Service are valued at the mean between the quoted bid prices (as obtained by the
Service  from dealers in such securities) and asked prices (as calculated by the
Service  based  upon  its  evaluation  of the market for such securities). Other
investments  (which  constitute  a  majority  of  the  portfolio securities) are
carried  at  fair  value  as  determined  by the Service, based on methods which
include  consideration of: yields or prices of securities of comparable quality,
coupon,  maturity  and  type; indications as to values from dealers; and general
market  conditions.  Short-term  investments, excluding U.S. Treasury Bills, are
carried  at  amortized  cost,  which  approximates  value. Financial futures are
valued  at  the  last  sales  price  on  the  securities  exchange on which such
securities  are  primarily  traded  or  at  the last sales price on the national
securities market on each business day.

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

(B)  SECURITIES  TRANSACTIONS AND INVESTMENT INCOME: Securities transactions are
recorded  on  a  trade  date  basis.  Realized  gain  and  loss  from securities
transactions  are  recorded  on  the  identified  cost  basis.  Interest income,
including,  where  applicable,  amortization  of  discount  on  investments,  is
recognized  on  the accrual basis. Under the terms of the custody agreement, the
fund  received  net  earnings credits of $6,989 during the period ended December
31,  1999  based on available cash balances left on deposit. Income earned under
this arrangement is included in interest income.

(C) DIVIDENDS TO SHAREHOLDERS: It is the policy of the fund to declare dividends
daily  from  investment  income-net.  Such dividends are paid monthly. Dividends
from  net realized capital gain are normally declared and paid annually, but the
fund  may  make  distributions  on  a  more  frequent  basis  to comply with the
distribution  requirements of the Internal Revenue Code of 1986, as amended (the
" Code" ). To the extent that net realized capital gain can be offset by capital
loss carryovers, it is the policy of the fund not to distribute such gain.

(D) FEDERAL INCOME TAXES: It is the policy of the fund to continue to qualify as
a  regulated  investment company, if such qualification is in the best interests
of  its  shareholders,  by complying with the applicable provisions of the Code,
and  to  make  distributions  of  taxable  income  sufficient to relieve it from
substantially all Federal income and excise taxes.

The  fund  has  an  unused  capital  loss carryover of approximately $17,033,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits,  if  any,  realized  subsequent  to December 31, 1999. This
amount  is  calculated  based on Federal income tax regulations which may differ
from  financial  reporting  in  accordance  with  generally  accepted accounting
prinicples.  If  not applied, $2,961,000 of the carryover expires in fiscal 2004
and $14,072,000 expires in fiscal 2007.

NOTE 2--Bank Line of Credit:

The  fund  participates  with  other  Dreyfus-managed  funds  in  a $500 million
redemption    credit    facility   (the   "Facility"  ) to   be   utilized   for

temporary  or  emergency  purposes,  including  the financing of redemptions. In
connection therewith, the fund has agreed to pay commitment fees on its pro rata
portion  of  the  Facility.  Interest  is  charged to the fund at rates based on
prevailing  market  rates  in effect at the time of borrowing. During the period
ended  December  31,  1999,  the  fund  did  not  borrow  under  the  Facility.

NOTE 3--Management Fee and Other Transactions  With Affiliates:

(A)  Pursuant  to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .60 of 1% of the value of the fund's average
daily net assets and is payable monthly. The Manager had undertaken from January
1, 1999 through December 31, 1999 to reduce the management fee paid by the fund,
to  the  extent  that  the fund's aggregate annual expenses, exclusive of taxes,
brokerage,  interest  on borrowings, commitment fees and extraordinary expenses,
exceeded  an  annual  rate of .80 of 1% of the value of the fund's average daily
net  assets.  The  reduction  in  management  fee,  pursuant to the undertaking,
amounted to $291,838 during the period ended December 31, 1999.

(B)  Under  the  Shareholder  Services Plan, the fund reimburses Dreyfus Service
Corporation,  a  wholly-owned subsidiary of the Manager, an amount not to exceed
an  annual rate of .25 of 1% of the value of the fund's average daily net assets
for certain allocated expenses of providing personal services and/or maintaining
shareholder  accounts.  The  services  provided  may  include  personal services
relating  to  shareholder  accounts,  such  as  answering  shareholder inquiries
regarding  the  fund  and  providing reports and other information, and services
related  to  the  maintenance  of  shareholder accounts. During the period ended
December  31,  1999,  the  fund was charged $303,347 pursuant to the Shareholder
Services Plan.

The  fund  compensates  Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to  perform transfer agency services for the fund. During the period
ended  December  31, 1999, the fund was charged $75,656 pursuant to the transfer
agency agreement.

                                                             The Fund

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

The  fund  compensates  Mellon under a custody agreement for providing custodial
services  for  the fund. During the period ended December 31, 1999, the fund was
charged $17,850 pursuant to the custody agreement.

(C)  Each  trustee  who  is  not  an  "affiliated  person" as defined in the Act
receives from the fund an annual fee of $2,500 and an attendance fee of $250 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation and the Trustee Emeritus receives 50% of such compensation.

NOTE 4--Securities Transactions:

(A)  The  aggregate  amount  of  purchases  and  sales  (including  paydowns) of
investment  securities,  excluding  short-term securities, options and financial
futures, during the period ended December 31, 1999, amounted to $625,756,838 and
$628,470,475, respectively.

In  addition, the following table summarizes the fund's call/put options written
during the period ended December 31, 1999:

<TABLE>

                                                                                                           Options Terminated
                                                                                                ---------------------------------
                                                      Number of                  Premiums                         Net Realized
Options Written:                                       Contracts              Received ($)          Cost ($)    Gain (Loss) ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>                    <C>               <C>                 <C>

Contracts outstanding
    December 31, 1998                                        300                  365,625

Contracts written                                          1,976                2,122,846

Contracts terminated:

    Closed                                                 1,676                1,770,502          1,487,148           283,354

    Exercised                                                450                  558,594            558,594               --

    Expired                                                  150                  159,375                --            159,375

    Total contracts terminated                             2,276                2,488,471          2,045,742           442,729

CONTRACTS OUTSTANDING
    DECEMBER 31, 1999                                         --                      --
</TABLE>


The  fund  may  purchase  and  write  (sell)  call/put  options in order to gain
exposure to or protect against changes in the market.

     As a writer of call options,  the fund receives a premium at the outset and
then bears the market risk of unfavorable  changes in the price of the financial
instruments underlying the options.  Generally,  the fund would incur a gain, to
the extent of the premium, if the price of the underlying  financial  instrument
decreases  between  the date the  option  is  written  and the date on which the
option is terminated.  Generally, the fund would realize a loss, if the price of
the financial instrument increases between those dates.

As  writer  of  put  options, the fund receives a premium at the outset and then
bears  the  market  risk  of  unfavorable  changes in the price of the financial
instruments  underlying  the options. Generally, the fund would incur a gain, to
the  extent  of the premium, if the price of the underlying financial instrument
increases  between  the  date  the  option  is written and the date on which the
option  is terminated. Generally, the fund would realize a loss, if the price of
the financial instrument decreases between those dates.

The  fund may invest in financial futures contracts in order to gain exposure to
or  protect against changes in the market. The fund is exposed to market risk as
a  result  of  changes  in  the  value  of the underlying financial instruments.
Investments in financial futures require the fund to "mark to market" on a daily
basis,  which  reflects  the  change in the market value of the contracts at the
close  of  each day's trading. Typically, variation margin payments are received
or  made  to  reflect  daily  unrealized gains or losses. When the contracts are
closed,  the  fund recognizes a realized gain or loss. These investments require
initial  margin  deposits  with  a  custodian,  which  consist  of  cash or cash
equivalents, up to approximately 10% of the contract amount. The amount of these
deposits  is  determined by the exchange or Board of Trade on which the contract
is traded and is subject to change. Contracts open at December 31, 1999, are set
forth in the Statement of Financial Futures.

(B) At December 31, 1999, accumulated net unrealized depreciation on investments
and  financial  futures  was  $4,079,082,  consisting  of  $904 gross unrealized
appreciation and $4,079,986 gross unrealized depreciation.

At  December  31,  1999, the cost of investments for Federal income tax purposes
was substantially the same as the cost for financial reporting purposes (see the
Statement of Investments).

                                                             The Fund

REPORT OF INDEPENDENT AUDITORS

Shareholders and Board of Trustees Dreyfus U.S. Treasury Long Term Fund

We  have audited the accompanying statement of assets and liabilities of Dreyfus
U.S.  Treasury  Long  Term  Fund,  including  the  statements of investments and
financial  futures,  as  of  December  31,  1999,  and  the related statement of
operations  for  the year then ended, the statement of changes in net assets for
each  of  the  two  years in the period then ended, and financial highlights for
each  of  the  years indicated therein. These financial statements and financial
highlights  are  the responsibility of the Fund's management. Our responsibility
is  to express an opinion on these financial statements and financial highlights
based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to  obtain  reasonable  assurance  about  whether  the  financial statements and
financial  highlights  are  free  of  material  misstatement.  An audit includes
examining,  on  a test basis, evidence supporting the amounts and disclosures in
the  financial  statements  and  financial  highlights.  Our procedures included
verification  by  examination of securities held by the custodian as of December
31,   1999  and  confirmation  of  securities  not  held  by  the  custodian  by
correspondence  with  others.  An  audit  also includes assessing the accounting
principles  used  and  significant  estimates  made  by  management,  as well as
evaluating  the  overall  financial  statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In  our  opinion,  the financial statements and financial highlights referred to
above  present  fairly,  in  all  material  respects,  the financial position of
Dreyfus  U.S.  Treasury  Long Term Fund at December 31, 1999, the results of its
operations  for  the  year then ended, the changes in its net assets for each of
the two years in the period then ended, and the financial highlights for each of
the indicated years, in conformity with accounting principles generally accepted
in the United States.
                                            [Ernst And Young LLP signature logo]


New York, New York

February 3, 2000


IMPORTANT TAX INFORMATION (Unaudited)

For  State  individual income tax purposes, the fund hereby designates 86.06% of
the  ordinary  income  dividends  paid during the fiscal year ended December 31,
1999  as  attributable  to interest income from direct obligations of the United
States.  Such dividends are currently exempt from taxation for individual income
tax  purposes in most states, including New York, California and the District of
Columbia.

                                                             The Fund

NOTES

                        For More Information

                        Dreyfus U.S. Treasury Long Term Fund
                        200 Park Avenue
                        New York, NY 10166

                        Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                        Custodian

                        Mellon Bank, N.A.
                        One Mellon Bank Center
                        Pittsburgh, PA 15258

                        Transfer Agent &
                        Dividend Disbursing Agent

                        Dreyfus Transfer, Inc.
                        P.O. Box 9671
                        Providence, RI 02940

                        Distributor

                        Premier Mutual Fund Services, Inc.
                        60 State Street
                        Boston, MA 02109

To obtain information:

BY TELEPHONE
Call 1-800-645-6561

BY MAIL  Write to:
The Dreyfus Family of Funds
144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL  Send your request to
[email protected]

ON THE INTERNET  Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 2000 Dreyfus Service Corporation                                  073AR9912





COMPARISON OF CHANGE IN VALUE OF $10,000 INVESTMENT
IN DREYFUS U.S. TREASURY LONG TERM FUND AND THE
MERRILL LYNCH GOVERNMENTS, U.S. TREASURY, LONG-TERM
(10 YEARS AND OVER) INDEX

EXHIBIT A:

                         MERRILL LYNCH
                          GOVERNMENTS,
                         U.S. TREASURY,
                            LONG-TERM        DREYFUS
                           (10 YEARS       U.S. TREASURY
 PERIOD                     AND OVER)        LONG TERM
                             INDEX*            FUND

12/31/89                    10,000          10,000
12/31/90                    10,646          10,702
12/31/91                    12,608          12,658
12/31/92                    13,610          13,614
12/31/93                    15,955          15,872
12/31/94                    14,769          14,415
12/31/95                    19,299          18,004
12/31/96                    19,107          18,160
12/31/97                    21,962          20,284
12/31/98                    24,937          22,469
12/31/99                    22,789          20,640


*Source: Bloomberg L.P.



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