DREYFUS BASIC MUNICIPAL MONEY MARKET FUND INC /MD/
N-30D, 2000-04-24
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Dreyfus BASIC Municipal Money Market Portfolio
SEMIANNUAL REPORT February 29, 2000

(reg.tm)





The  views  expressed herein are current to the date of this report. These views
and  the composition of the 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 portfolio could be adversely affected if the computer systems used by
Dreyfus and the portfolio'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 portfolio invests may be adversely affected by year
2000-related problems. This could have an impact on the value of the portfolio's
investments and its share price.


                                 Contents

                                 THE PORTFOLIO
- ------------------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Performance

                             6   Statement of Investments

                            12   Statement of Assets and Liabilities

                            13   Statement of Operations

                            14   Statement of Changes in Net Assets

                            15   Financial Highlights

                            16   Notes to Financial Statements

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

                                 Back Cover

                                                                  The Portfolio

                                 Dreyfus BASIC Municipal Money Market Portfolio

LETTER FROM THE PRESIDENT

Dear Shareholder:

We  are  pleased  to  present this semiannual report for Dreyfus BASIC Municipal
Money  Market  Portfolio,  covering  the six-month period from September 1, 1999
through  February  29,  2000. Inside, you'll find valuable information about how
the  fund  was  managed during the reporting period, including a discussion with
the fund's portfolio manager, Jill Shaffro.

When  the  reporting  period  began,  it  became apparent that international and
domestic  economies  were  growing faster than analysts expected, giving rise to
concerns  that  long-dormant  inflationary  pressures might re-emerge. Consumers
continued  to  spend heavily, unemployment levels reached new lows and the stock
market continued to climb.

Because   unsustainable   economic  growth  may  trigger  unwanted  inflationary
pressures,  the Federal Reserve Board raised key short-term interest rates twice
more  during  the  reporting  period. In total, the Federal Reserve Board raised
short-term  interest rates by 1.00 percentage point since late June 1999, before
the  current  reporting  period began. In this environment, yields on tax-exempt
money market securities rose.

We  appreciate  your confidence over the past six months, and we look forward to
your continued participation in Dreyfus BASIC Municipal Money Market Portfolio.

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
March 23, 2000




DISCUSSION OF PERFORMANCE

Jill Shaffro, Portfolio Manager

How did Dreyfus BASIC Municipal Money Market Portfolio perform during the
period?

For  the six-month period that began on September 1, 1999 and ended February 29,
2000,  the  portfolio  produced  an annualized tax-exempt yield of 3.11%. Taking
into  account  the  effects of compounding, the portfolio provided an annualized
effective yield of 3.15%.(1)

What is the portfolio's investment approach?

The   portfolio  seeks  a  high  level  of  federally  tax-exempt  income  while
maintaining  a  stable  $1.00  share  price.  We  are especially vigilant in our
efforts to preserve capital.

In  pursuing this objective, we employ two primary strategies. First, we attempt
to  add  value  by  constructing a diverse portfolio of high quality, tax-exempt
money  market  instruments.  Second,  we actively manage the portfolio's average
maturity  in  anticipation of interest-rate trends and supply-and-demand changes
in the short-term municipal marketplace.

For  example, if we expect an increase in short-term supply, we may decrease the
average  maturity  of  the  portfolio,  which  would  enable  us to purchase new
securities  with higher yields. Yields tend to rise when there is an increase in
new-issue  supply  competing for investor interest. New securities are generally
issued   with  maturities  in  the  one-year  range,  which  will  lengthen  the
portfolio' s  weighted  average  maturity.  If  we  anticipate limited new-issue
supply,  we  may  extend  the  portfolio' s average maturity to maintain current
yields  for  as long as practical. At other times, we try to maintain an average
maturity  that  reflects  our view of short-term interest-rate trends and future
supply-and-demand considerations.

                                                       The Portfolio


DISCUSSION OF PERFORMANCE (CONTINUED)

What other factors influenced the portfolio's performance?

The  portfolio was influenced by robust U.S. economic growth and rising interest
rates    throughout    the    six-month    reporting    period.

By  the  time the reporting period began on September 1, 1999, it was clear that
economic  growth  in  the  United  States  and  overseas  was stronger than many
analysts  had  expected.  In the U.S., consumer confidence had reached a 30-year
high,  oil prices had bounced back from the previous year's lows, and employment
was strong with hourly wages rising. These economic forces raised concerns among
fixed-income investors that long-dormant inflationary pressures might re-emerge.
In response, the Federal Reserve Board increased short-term interest rates twice
during  the  summer of 1999, before the start of the six-month reporting period.
The  Fed  then  implemented  two additional rate hikes in November and February,
during the reporting period, for a total increase of 1.00 percentage point since
last summer.

Although  these  interest-rate  increases caused short-term tax-exempt yields to
rise  throughout  the  reporting  period, tax-exempt money market yields did not
rise  as  much  as  comparable  taxable  yields.  That's because many states and
municipalities  enjoyed  higher  tax  revenues  during  this  period of economic
prosperity.  As a result, many municipalities had less need to borrow to satisfy
their short-term obligations.

What is the portfolio's current strategy?

We have continued to manage the portfolio's average maturity according to our
supply-and-demand expectations. Accordingly, we adopted a relatively long
average maturity last fall to maintain competitive yields during a time of
little new issuance. We later allowed the portfolio's average maturity to
decline naturally as existing holdings matured, enabling us to capture then
prevailing higher yields during the fourth quarter of 1999, when issuance
increased. We again extended the average maturity toward the end of the year to
take advantage of market weakness in advance of potential Year 2000 concerns,
which ultimately proved unfounded. We ended the reporting period with a weighted
average maturity that was slightly longer than neutral. This position was
designed to maintain competitive yields through March, typically a low-issuance
month.

Our  security selection strategy continued to focus on very high quality, liquid
money  market  instruments from an array of issuers. Some of the most frequently
used  instruments  included  Variable  Rate  Demand Notes (VRDNs), which feature
adjustable  yields,  short maturities, and afford the portfolio a high degree of
liquidity  and  credit  quality.  Toward  the  end  of  the reporting period, we
modestly  reduced  our holdings of VRDNs in favor of tax-exempt commercial paper
with  maturities  in  the three- to nine-month range, which helped us extend the
portfolio' s average weighted maturity. These securities offered a high level of
liquidity,  strong  credit  characteristics  and  competitive yields. Of course,
portfolio composition will change over time.

March 23, 2000

(1)  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE. AN INVESTMENT IN THE PORTFOLIO IS NOT INSURED OR GUARANTEED BY THE
FDIC OR ANY OTHER GOVERNMENT AGENCY. ALTHOUGH THE PORTFOLIO SEEKS TO PRESERVE
THE VALUE OF YOUR INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY
INVESTING IN THE PORTFOLIO.

                                                       The Portfolio

STATEMENT OF INVESTMENTS

February 29, 2000 (Unaudited)

STATEMENT OF INVESTMENTS

<TABLE>

                                                                                              Principal
TAX EXEMPT INVESTMENTS-98.2%                                                                 Amount ($)               Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                          <C>                      <C>

ALABAMA--4.6%

Decatur, IDB, SWDR, VRDN (Trico Steel Co. LLC Project)

   4% (LOC; Chase Manhattan Bank)                                                            25,000,000  (a)          25,000,000

CALIFORNIA--5.3%

California Higher Education Loan Authority Inc.,

  Student Loan Revenue

  3.55%, Series C, 7/1/2000

   (LOC; Student Loan Marketing Association)                                                 19,000,000               19,000,000

California School Cash Reserve Program Authority

   4%, Series A, 7/3/2000 (Insured; AMBAC)                                                   10,000,000               10,029,564

COLORADO--2.7%

Colorado Student Obligation Bond Authority,

  Student Loan Revenue, VRDN

  3.95%, Series A

   (LOC; Student Loan Marketing Association)                                                 15,000,000  (a)          15,000,000

DISTRICT OF COLUMBIA--.9%

District of Columbia, Revenue, VRDN

  (George Washington University)

  3.90%, Series B (Insured; MBIA and Liquidity

   Facility; Bank of America)                                                                 5,000,000  (a)           5,000,000

FLORIDA--1.7%

Sarasota County Public Hospital District, HR, CP

  (Memorial Hospital Project)

   3.80%, Series A (LOC; SunTrust Bank)                                                       9,045,000                9,045,000

GEORGIA--3.7%

Savannah Economic Development Authority, Exempt

  Revenue, VRDN (Home Depot Project)

   4.04%, Series A (Corp. Guaranty; Home Depot)                                              20,000,000  (a)          20,000,000

ILLINOIS--2.7%

Cook County, GO

   6.30%, 11/1/2000 (Insured; AMBAC)                                                          3,000,000                3,043,761

Cook County, Capital Improvement, Refunding, GAN

   5%, 11/15/2000 (Insured; FGIC)                                                             4,540,000                4,569,476

Illinois Development Finance Authority, Revenue,

  Refunding (Provena Health)

   4.50%, Series A, 5/15/2000 (Insured; MBIA)                                                 2,630,000                2,633,672

Village of Lombard, MFHR (Clover Creek)

   4.05%, 12/15/2000 (LOC; Bank One of Arizona)                                               4,800,000                4,800,000

INDIANA--5.6%

Indiana Bond Bank Advance Funding Program

   4.75%, Series A-2, 1/18/2001 (LOC; Bank of America)                                        8,000,000                8,039,420


                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)                Value ($)
- -----------------------------------------------------------------------------------------------------------------------------------

INDIANA (CONTINUED)

Indiana Health Facility Authority, Revenue, VRDN

   (Ascension Health Credit) 3.75%                                                           10,000,000  (a)          10,000,000

State of Indiana, University Revenues, Prerefunded

   (Student Fee) 7%, Series G, 8/1/2000                                                       2,535,000                2,615,784

Petersburg, SWDR, VRDN

  (Indiana Power and Light Co. Project)

  3.95% Series A (Corp. Guaranty; Indiana Power

   and Light Co. Project)                                                                    10,000,000  (a)          10,000,000

IOWA--1.8%

Louisa County, PCR, Refunding, VRDN

   (Midwest Power System Inc. Project) 3.95%                                                 10,000,000  (a)          10,000,000

KANSAS--1.7%

Wichita, Water and Sewer Utility Revenue

   6.50%, 10/1/2000 (Insured; FGIC)                                                           1,850,000                1,874,785

Wyandotte County Government Temporary Notes

  (Kansas City University):

      4.30%, Series 8, 12/1/2001                                                              4,015,000                4,015,000

      4.40%, Series 5, 12/1/2001                                                              1,262,500                1,262,500

      4.40%, Series 6, 12/1/2001                                                              2,095,750                2,095,750

KENTUCKY--6.2%

City of Carroll, Collateralized Solid Waste Disposal Facilities

  Revenue, VRDN (Kentucky Utilities Co. Project)

   3.95%, Series A (Corp. Guaranty; Kentucky                                                 23,700,000  (a)          23,700,000

   Utilities Co.)

Kentucky Association of Counties Advance Revenue Cash

   Flow Borrowing Program, COP, TRAN 4%, 6/30/2000                                           10,000,000               10,017,570

LOUISIANA--4.7%

Plaquemines Port, Harbor and Terminal District, Port

  Facilities Revenue

  (International Marine Terminal Project)

  3%, Series B, 3/15/2000

   (LOC; Morgan Guaranty Trust Co.)                                                           5,775,000                5,775,000

West Baton Rouge Parish Industrial District Number 3,

  Revenue, VRDN (Dow Chemical Co. Project)

   4%, Series A (Corp. Guaranty; Dow Chemical Co.)                                           20,000,000  (a)          20,000,000

MICHIGAN--3.2%

Grand Rapids Economic Development Corporation,

  Revenue, VRDN

  (Amway/Grand Plaza Hotel Facility # 1)

   3.75% (LOC; Old Kent Bank and Trust Co.)                                                   4,000,000  (a)           4,000,000

                                                                                           The Portfolio

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

                                                                                             Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                          Amount ($)                 Value ($)
- ------------------------------------------------------------------------------------------------------------------------------------

MICHIGAN (CONTINUED)

Michigan Hospital Finance Authority, Revenue, Refunding

  (Mid-Michigan Obligation Group)

   4.75%, Series A 6/1/2000 (Insured; FSA)                                                    1,750,000                1,752,476

Michigan South Central Power Agency, Power Supply

  System Revenue, Refunding

   5.20%,11/1/2000 (Insured; MBIA)                                                            5,510,000                5,550,981

Michigan Strategic Fund, LOR, VRDN

  (Pierce Foundation Project)

   3.70% (LOC; Michigan National Bank)                                                        6,000,000  (a)           6,000,000

MINNESOTA--2.8%

Minnesota Higher Education Coordinating Board, Revenue,

   VRDN 3.95% (LOC; Norwest Bank of Minnesota)                                               15,500,000  (a)          15,500,000

MISSOURI--2.8%

Missouri Higher Education Loan Authority, Student Loan

  Revenue, Refunding, VRDN

  4%, Series B (Insured; MBIA and SBPA; NMB Post

   Bank Group)                                                                                9,500,000  (a)           9,500,000

St. Louis General Fund, Revenue, TRAN 4%, 6/30/2000                                           6,000,000                6,014,401

NEVADA--.7%

Clark County, EDR, VRDN

  (Lutheran Secondary School Association Project)

   4% (LOC; Allied Irish Banks)                                                               4,000,000  (a)           4,000,000

NEW HAMPSHIRE--4.5%

State of New Hampshire Business Finance Authority, PCR,

  CP (New England Power Co. Project)

  3.70%, Series B, 4/24/2000

   (Corp. Guaranty; New England Power Co.)                                                   18,000,000               18,000,000

Rockingham County, TAN 4.75%, 12/29/2000                                                      6,500,000                6,523,388

NEW JERSEY--.9%

New Jersey Transport Authority, CP

  3.85%, Series A, 3/10/2000 (Liquidity Facility: Bank of

   Nova Scotia, Commerzbank and Toronto-Dominion Bank)                                        5,000,000                5,000,000

NEW MEXICO--1.8%

State of New Mexico, TRAN 4%, 6/30/2000                                                      10,000,000               10,024,631

NEW YORK--1.7%

Suffolk County, TAN 4.50%, Series 1, 8/10/2000

  (LOC: Credit Local de France, Landesbank Hessen and

   West Deutchlandesbank)                                                                     9,000,000                9,019,375

OHIO--6.1%

Hillard School District, BAN 4.59%, 5/25/2000                                                 5,000,000                5,008,023


                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)                Value ($)
- -----------------------------------------------------------------------------------------------------------------------------------

OHIO (CONTINUED)

Ohio Housing Finance Agency, Mortgage Revenue

   (Residential) 3.05%, Series A-2, 3/1/20003                                                14,000,000               14,000,000

Ohio Water Development Authority, Pollution Control

  Facility, Revenue, Refunding, VRDN

  (Duquesne Light Co.)

  4%, Series A (Insured; AMBAC and Liquidity

   Facility; The Bank of New York)                                                            7,000,000  (a)           7,000,000

Summit County, BAN 3.80%, Series A, 6/1/2000                                                  7,510,000                7,520,971

OREGON--1.5%

Oregon Housing and Community Services Department, SFMR

   3.45%, Series G, 6/29/2000                                                                 8,110,000                8,110,000

PENNSYLVANIA--5.5%

Allegheny County Hospital Development Authority, HR

  (South Hills Health System)

   3.15%, 4/1/2000 (LOC; PNC Bank of Ohio)                                                    8,000,000               8,000,000

Emmaus General Authority, Revenue, VRDN

  3.85% (Insured; FSA and Liquidity Facility; First Union

   National Bank)                                                                            15,000,000  (a)          15,000,000

Pennsylvania Energy Development Authority, Energy

  Development Revenue, VRDN

  (B & W Ebensburg Project)

   3.95% (LOC; Landesbank Hessen)                                                             6,985,000  (a)           6,985,000

SOUTH CAROLINA--.3%

Lexington County Health Services District Inc.,

  Hospital Improvement Revenue, Refunding

   4.25%, 11/1/2000 (Insured; FSA)                                                            1,665,000                1,666,005

TENNESSEE--1.8%

Sevier County Public Building Authority, Local Government

  Public Improvement, VRDN

  3.85%, Series III-C-5 (Insured; AMBAC and LOC;

   Landesbank Hessen)                                                                        10,000,000  (a)          10,000,000

TEXAS--14.1%

Brazos River Harbor Navigation District, Harbor Revenue,

  VRDN (Dow Chemical Co. Project)

   4% (Corp. Guaranty; Dow Chemical Co.)                                                     22,300,000  (a)          22,300,000

El Paso Industrial Development Authority Inc., IDR,

  VRDN (El Paso School District Limited Project)

   3.90% (LOC; Chase Manhattan Bank)                                                          2,400,000  (a)           2,400,000

Gulf Coast Industrial Development Authority, SWDR,

  VRDN (Citgo Petroleum Project)

   3.95% (LOC; Wachovia Bank of Georgia)                                                     14,000,000  (a)          14,000,000

                                                                                           The Portfolio

STATEMENT OF INVESTMENTS (Unaudited) (CONTINUED)

                                                                                              Principal
TAX EXEMPT INVESTMENTS (CONTINUED)                                                           Amount ($)               Value ($)
- -----------------------------------------------------------------------------------------------------------------------------------

TEXAS (CONTINUED)

Harris County Health Facilities Development Corporation,

  HR, VRDN (Texas Children's Hospital)

  3.95%, Series B-1 (Insured; MBIA and Liquidity Facility;

   Morgan Guaranty Trust Co.)                                                                 5,000,000  (a)           5,000,000

Panhandle Plains Higher Education Authority Inc., Student

  Loan Revenue, VRDN

  3.95%, Series A

   (LOC; Student Loan Marketing Association)                                                 20,000,000  (a)          20,000,000

Port Development Corporation, Marine Terminal Revenue,

  VRDN (Pasadena Terminal Co. Inc., Project)

   4.10% (LOC; ABN-Amro Bank)                                                                 2,420,000  (a)           2,420,000

State of Texas, TRAN 4.50%, Series A, 8/31/2000                                              10,000,000               10,032,449

West Texas Municipal Power Agency, Electric Revenue

   4.20%, 2/15/2001 (Insured; MBIA)                                                           1,000,000                  999,973

UTAH--1.2%

Utah Housing Finance Agency, Multi-Family Housing,

  Refunding, VRDN (Candlestick)

   3.93% (LOC; Bank One Corp.)                                                                6,400,000  (a)           6,400,000

VIRGINIA--4.2%

Hopewell Industrial Development Authority, Exempt

  Facilities, Revenue, VRDN (Hadson Power 13)

   3.95%, Series A (LOC; Credit Suisse)                                                       5,000,000  (a)           5,000,000

Richmond Industrial Development Authority, Revenue,

  VRDN (Cogentrix of Richmond Project):

      4.10% Series A (LOC; Banque Paribas)                                                    8,300,000  (a)           8,300,000

      4.10% Series B (LOC; Banque Paribas)                                                    6,000,000  (a)           6,000,000

   Exempt Facilities 4.10%, Series A

   (LOC; Banque Paribas)                                                                      3,400,000  (a)           3,400,000

WASHINGTON--1.7%

Washington Housing Finance Commission, Multi-Family

  Revenue, Refunding, VRDN

   (Avalon Ridge Apartments Project) 3.90% (LOC; FNMA)                                        9,255,000  (a)           9,255,000

WYOMING--1.8%

Unita County, PCR, Refunding (Chervon USA Inc. Project)

   3.85%, 5/1/2000 (Corp. Guaranty; Chervon USA Inc.)                                        10,000,000               10,000,000
- -----------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS (cost $537,199,952)                                                             98.2%              537,199,955

CASH AND RECEIVABLES (NET)                                                                         1.8%               10,068,960

NET ASSETS                                                                                       100.0%              547,268,915


Summary of Abbreviations

AMBAC               American Municipal Bond                             MBIA                 Municipal Bond Investors
                        Assurance Corporation                                                    Assurance Insurance
BAN                 Bond Anticipation Notes                                                      Corporation
COP                 Certificate of Participation                        MFHR                 Multi-Family Housing
CP                  Commercial Paper                                                             Revenue
EDR                 Economic Development Revenue                        PCR                  Pollution Control Revenue
FGIC                Financial Guaranty                                  SBPA                 Standby Bond Purchase
                        Investment Company                                                       Agreement
FNMA                Federal National                                    SFMR                 Single Family Mortgage
                        Mortgage Association                                                     Revenue
FSA                 Financial Security Assurance                        SWDR                 Solid Waste
GAN                 Grant Anticipation Notes                                                     Disposal Revenue
GO                  General Obligation                                  TAN                  Tax Anticipation Notes
HR                  Hospital Revenue                                    TRAN                 Tax and Revenue
IDB                 Industrial Development Board                                                 Anticipation Notes
IDR                 Industrial Development Revenue                      VRDN                 Variable Rate
LOC                 Letter of Credit                                                             Demand Notes
LOR                 Limited Obligation Revenue

Summary of Combined Ratings (Unaudited)

Fitch                or          Moody's               or        Standard & Poor's                           Value (%)
- ------------------------------------------------------------------------------------------------------------------------------------

F1+/F1                           VMIG1/MIG1, P1                  SP1+/SP1, A1+/A1                                 90.4
AAA/AA (b)                       Aaa/Aa (b)                      AAA/AA (b)                                        8.4
Not Rated (c)                    Not Rated (c)                   Not Rated (c)                                     1.2
                                                                                                                 100.0

(A)  SECURITIES PAYABLE ON DEMAND.VARIABLE INTEREST RATE--SUBJECT TO PERIODIC
     CHANGE.

(B)  NOTES WHICH ARE NOT F, MIG OR SP RATED ARE REPRESENTED BY BOND RATINGS OF
     THE ISSUERS.

(C)  SECURITIES WHICH, WHILE NOT RATED BY FITCH, MOODY'S AND STANDARD & POOR'S
     HAVE BEEN DETERMINED BY THE MANAGER TO BE OF COMPARABLE QUALITY TO THOSE
     RATED SECURITIES IN WHICH THE PORTFOLIO MAY INVEST.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                       The Portfolio



STATEMENT OF ASSETS AND LIABILITIES

February 29, 2000 (Unaudited)

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

ASSETS ($):

Investments in securities--See Statement of
Investments                                           537,199,952  537,199,955

Cash                                                                  6,207,741

Interest receivable                                                   4,011,361

Prepaid expenses                                                         21,895

                                                                    547,440,952
- --------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                           129,698

Accrued expenses and other liabilities                                   42,339

                                                                        172,037
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      547,268,915
- --------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                     547,396,120

Accumulated net realized gain (loss) on investments                   (127,208)

Accumulated gross unrealized appreciation on investments                    3
- --------------------------------------------------------------------------------

NET ASSETS ($)                                                      547,268,915
- --------------------------------------------------------------------------------

SHARES OUTSTANDING

(3 billion shares of $.001 par value Common Stock authorized)       547,396,120

NET ASSET VALUE, offering and redemption price per share ($)               1.00

SEE NOTES TO FINANCIAL STATEMENTS.



STATEMENT OF OPERATIONS

Six Months Ended February 29, 2000 (Unaudited)

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

INVESTMENT INCOME ($):

INTEREST INCOME                                                      9,953,399

EXPENSES:

Management fee--Note 2(a)                                            1,398,046

Shareholder servicing costs--Note 2(b)                                 168,328

Custodian fees                                                          27,806

Professional fees                                                       26,838

Registration fees                                                       13,213

Prospectus and shareholders' reports                                     7,080

Directors' fees and expenses--Note 2(c)                                  4,508

Miscellaneous                                                            7,198

TOTAL EXPENSES                                                       1,653,017

Less--reduction in management fee due to

   undertaking--Note 2(a)                                             (394,395)

NET EXPENSES                                                         1,258,622

INVESTMENT INCOME--NET                                               8,694,777
- --------------------------------------------------------------------------------

NET UNREALIZED APPRECIATION ON INVESTMENTS                                  3

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                 8,694,780

SEE NOTES TO FINANCIAL STATEMENTS.

                                                       The Portfolio


STATEMENT OF CHANGES IN NET ASSETS

                                         Six Months Ended
                                        February 29, 2000           Year Ended
                                              (Unaudited)      August 31, 1999
- --------------------------------------------------------------------------------

OPERATIONS ($):

Investment income--net                          8,694,777           17,754,729

Net realized gain (loss) from investments            --                   530

Net unrealized appreciation (depreciation)

   on investments                                      3                  --

NET INCREASE (DECREASE) IN NET ASSETS

   RESULTING FROM OPERATIONS                   8,694,780            17,755,259
- --------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS FROM ($):

INVESTMENT INCOME--NET                        (8,694,777)         (17,754,729)
- --------------------------------------------------------------------------------

CAPITAL STOCK TRANSACTIONS ($1.00 per share):

Net proceeds from shares sold                 229,921,604         511,053,083

Dividends reinvested                            8,245,591          16,884,847

Cost of shares redeemed                     (300,430,168)        (533,875,712)

INCREASE (DECREASE) IN NET ASSETS

   FROM CAPITAL STOCK TRANSACTIONS           (62,262,973)          (5,937,782)

TOTAL INCREASE (DECREASE) IN NET ASSETS      (62,262,970)          (5,937,252)
- --------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                           609,531,885          615,469,137

END OF PERIOD                                 547,268,915          609,531,885

SEE NOTES TO FINANCIAL STATEMENTS.



FINANCIAL HIGHLIGHTS

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

<TABLE>

                                               Six Months
                                               Ended
                                               February 29,
                                                      2000                                   Year Ended August 31,
                                                                    ---------------------------------------------------------------
                                                (Unaudited)         1999          1998          1997           1996          1995
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                                                  <C>            <C>           <C>           <C>            <C>            <C>

PER SHARE DATA ($):

Net asset value, beginning
   of period                                          1.00          1.00          1.00          1.00           1.00          1.00

Investment Operations:

Investment income--net                                 .015          .029          .033          .033           .034          .037

Distributions:

Dividends from investment
    income--net                                       (.015)        (.029)        (.033)         (.033)        (.034)        (.037)

Net asset value, end of period                        1.00          1.00          1.00           1.00          1.00          1.00
- ------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                      3.13(a)       2.90          3.31           3.31          3.42          3.80
- ------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                  .45(a)        .45           .45           .45            .38           .14

Ratio of net investment income

   to average net assets                              3.10(a)       2.86          3.26          3.26           3.40          3.73

Decrease reflected in

  above expense ratios

  due to undertakings by

   The Dreyfus Corporation                             .14(a)        .15           .17           .15            .22           .45

Net Assets, end of period
   ($ x 1,000)                                      547,269      609,532       615,469        683,562        804,257     1,099,434

(A) ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                       The Portfolio

NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--Significant Accounting Policies:

Dreyfus  BASIC  Municipal Money Market Portfolio (the "portfolio") is a separate
non-diversified  series of Dreyfus BASIC Municipal Fund, Inc. (the "fund") which
is  registered under the Investment Company Act of 1940, as amended (the "Act"),
as  an  open-end  management investment company and operates as a series company
currently  offering  four  series  including  the  portfolio.  The  portfolio' s
investment  objective  is  to  provide investors with as high a level of current
income  exempt from Federal income tax as is consistent with the preservation of
capital  and  maintenance  of liquidity. The Dreyfus Corporation (the "Manager")
serves as the portfolio's investment adviser. The Manager is a direct subsidiary
of  Mellon  Bank,  N.A.,  which is a wholly-owned subsidiary of Mellon Financial
Corporation.  Premier  Mutual  Fund  Services,  Inc.  is  the distributor of the
portfolio's shares, which are sold to the public without a sales charge.

The  fund accounts separately for the assets, liabilities and operations of each
series.  Expenses  directly  attributable  to  each  series  are charged to that
series'  operations;  expenses  which are applicable to all series are allocated
among them on a pro rata basis.

It  is the portfolio's policy to maintain a continuous net asset value per share
of  $1.00; the portfolio has adopted certain investment, portfolio valuation and
dividend and distribution policies to enable it to do so. There is no assurance,
however,  that  the  portfolio will be able to maintain a stable net asset value
per share of $1.00.

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 are valued at amortized cost,
which has been determined by the fund's Board of Directors to represent the fair
value of the portfolio's investments.


(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade date basis. Interest income, adjusted for amortization of
premiums  and original issue discounts on investments, is earned from settlement
date and recognized on the accrual basis. Realized gain and loss from securities
transactions  are  recorded  on  the  identified cost basis. Cost of investments
represents  amortized  cost.  Under  the  terms  of  the  custody agreement, the
portfolio  received  net  earnings  credits  of  $14,574 during the period ended
February  29,  2000  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 portfolio 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 portfolio 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 portfolio not to
distribute such gain.

(d)  Federal  income  taxes:  It  is  the policy of the portfolio to continue to
qualify  as  a  regulated  investment  company,  which can distribute tax exempt
dividends,  by complying with the applicable provisions of the Code, and to make
distributions  of  income and net realized capital gain sufficient to relieve it
from substantially all Federal income and excise taxes.

The  portfolio  has  an  unused capital loss carryover of approximately $128,000
available  for  Federal  income  tax  purposes  to be applied against future net
securities  profits, if any, realized subsequent to August 31, 1999. This amount
is  calculated  based  on  Federal  income tax regulations which may differ from
financial reporting in accordance with generally accepted accounting principles.
If  not  applied, $1,700 of the carryover expires in fiscal 2001, $2,000 expires
in fiscal
                                                                   The Portfolio

NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

2002,  $50,300  expires  in fiscal 2003, $36,000 expires in fiscal 2004, $25,000
expires  in  fiscal  2005,  $1,000 expires in fiscal 2006 and $12,000 expires in
fiscal 2007.

At  February  29,  2000, 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).

NOTE 2--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 .50 of 1% of the value of the portfolio's average
daily  net assets and is payable monthly. The Manager has undertaken, until such
time  as  it  gives  shareholders  at  least 90 days' notice to the contrary, to
reduce  the  management  fee  paid  by  the  portfolio,  to  the extent that the
portfolio' s  aggregate  expenses,  exclusive  of  taxes, brokerage, interest on
borrowings and extraordinary expenses, exceed an annual rate of .45 of 1% of the
value  of  the portfolio's average daily net assets. The reduction in management
fee,  pursuant  to the undertaking, amounted to $394,395 during the period ended
February 29, 2000.

(b)  Under  the  Shareholder  Services  Plan,  the  portfolio 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 portfolio'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 portfolio's and providing reports and other information,
and  services  related  to  the  maintenance of shareholder accounts. During the
period  ended  February 29, 2000, the portfolio was charged $125,205 pursuant to
the Shareholder Services Plan.

The portfolio compensates Dreyfus Transfer, Inc., a wholly-owned subsidiary of
the Manager, under a transfer agency agreement for pro viding personnel and
facilities to perform transfer agency services for the fund. During the period
ended February 29, 2000, the portfolio was charged $27,731 pursuant to the
transfer agency agreement.

(c)  Each  director  who  is  not  an  "affiliated person" as defined in the Act
receives from the fund an annual fee of $1,000 and an attendance fee of $250 per
meeting.  The  Chairman  of  the  Board  receives  an  additional  25%  of  such
compensation.

NOTE 3--Subsequent Event

At  a  meeting  of  the  fund's Board of Directors held on January 19, 2000, the
Board  approved  the  termination of the portfolio's Distribution Agreement with
Premier  Mutual  Services,  Inc.  and approved a new Distribution Agreement with
Dreyfus Service Corporation. The new Distribution Agreement with Dreyfus Service
Corporation became effective on March 22, 2000.

                                                       The Portfolio

NOTES

                                                           For More Information

                        Dreyfus BASIC Municipal
                        Money Market Portfolio
                        200 Park Avenue
                        New York, NY 10166

                            Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                            Custodian

                        The Bank of New York
                        100 Church Street
                        New York, NY 10286

                            Transfer Agent &
                            Dividend Disbursing Agent

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

                            Distributor

                        Dreyfus Service Corporation
                        200 Park Avenue
                        New York, NY 10166


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                                   122SA002



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