<PAGE> PAGE 1
000 B000000 01/31/98
000 C000000 0000843781
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 U
001 A000000 DREYFUS TREASURY PRIME CASH MANAGEMENT
001 B000000 811-5718
001 C000000 2129226754
002 A000000 200 PARK AVENUE
002 B000000 NEW YORK
002 C000000 NY
002 D010000 10166
002 D020000 0144
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
018 000000 Y
019 A000000 Y
019 B000000 151
019 C000000 DREYFUSFAM
022 A000001 DONALDSON, LUFKIN & JENRETTE SECURITIES CORP.
022 B000001 13-2741729
022 C000001 5377901
022 D000001 2468567
022 A000002 ABN AMRO SECURITIES (USA) INC.
022 B000002 13-3227945
022 C000002 1766838
022 D000002 994336
022 A000003 BARCLAYS DE ZOETE WEDD SECURITIES, INC.
022 B000003 13-3551367
022 C000003 1219603
022 D000003 1310754
022 A000004 UBS SECURITIES INC.
022 B000004 13-2932996
022 C000004 699288
022 D000004 558153
022 A000005 SBC CAPITAL MARKETS
022 B000005 13-3498485
022 C000005 1107742
022 D000005 138962
022 A000006 CHASE SECURITIES INC.
022 B000006 13-3112953
022 C000006 586788
022 D000006 411588
<PAGE> PAGE 2
022 A000007 GOLDMAN, SACHS & CO.
022 B000007 13-5108880
022 C000007 367678
022 D000007 614020
022 A000008 AUBREY G. LANSTON & CO. INC.
022 B000008 13-5552129
022 C000008 673333
022 D000008 174702
022 A000009 THE NIKKO SECURITIES CO. INTERNATIONAL, INC.
022 B000009 94-1302123
022 C000009 694846
022 D000009 118008
022 A000010 CS FIRST BOSTON CORPORATION
022 B000010 13-5659485
022 C000010 421318
022 D000010 192582
023 C000000 15354948
023 D000000 7397169
028 A010000 3986511
028 A020000 5256
028 A030000 0
028 A040000 3941572
028 B010000 3902897
028 B020000 4939
028 B030000 0
028 B040000 4029430
028 C010000 4330628
028 C020000 5273
028 C030000 0
028 C040000 4282291
028 D010000 3811096
028 D020000 5404
028 D030000 0
028 D040000 3493880
028 E010000 5680524
028 E020000 5719
028 E030000 0
028 E040000 5175458
028 F010000 4147830
028 F020000 6108
028 F030000 0
028 F040000 4803745
028 G010000 25859486
028 G020000 32699
028 G030000 0
028 G040000 25726376
028 H000000 0
042 A000000 81
042 B000000 0
042 C000000 19
042 D000000 0
<PAGE> PAGE 3
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 980
044 000000 0
062 A000000 Y
062 B000000 99.6
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
063 A000000 81
063 B000000 0.0
064 A000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
071 A000000 0
071 B000000 0
071 C000000 0
071 D000000 0
072 A000000 12
072 B000000 181678
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 6765
072 G000000 0
072 H000000 0
072 I000000 0
072 J000000 0
072 K000000 0
072 L000000 0
072 M000000 0
072 N000000 0
072 O000000 0
<PAGE> PAGE 4
072 P000000 0
072 Q000000 0
072 R000000 0
072 S000000 0
072 T000000 980
072 U000000 0
072 V000000 0
072 W000000 0
072 X000000 7745
072 Y000000 0
072 Z000000 173933
072AA000000 0
072BB000000 174
072CC010000 0
072CC020000 0
072DD010000 156045
072DD020000 17888
072EE000000 0
073 A010000 0.0000
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 6700
074 B000000 0
074 C000000 3314694
074 D000000 0
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 339694
074 K000000 0
074 L000000 64301
074 M000000 0
074 N000000 3725389
074 O000000 276820
074 P000000 645
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 120118
074 S000000 0
074 T000000 3327806
074 U010000 2907545
074 U020000 420578
074 V010000 0.00
074 V020000 0.00
074 W000000 0.9999
074 X000000 1745
<PAGE> PAGE 5
074 Y000000 0
075 A000000 3017254
075 B000000 0
076 000000 0.00
077 A000000 Y
077 B000000 Y
080 A000000 VIGILANT INSURANCE COMPANY
080 B000000 NATIONAL UNION FIRE INSURANCE CO. OF PITT/PA
080 C000000 125000
081 A000000 Y
081 B000000 170
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
SIGNATURE MICHAEL S. PETRUCELLI
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000843781
<NAME> DREYFUS TREASURY PRIME CASH MANAGEMENT
<SERIES>
<NUMBER> 001
<NAME> INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1998
<PERIOD-END> JAN-31-1998
<INVESTMENTS-AT-COST> 3314694
<INVESTMENTS-AT-VALUE> 3314694
<RECEIVABLES> 403995
<ASSETS-OTHER> 6700
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3725389
<PAYABLE-FOR-SECURITIES> 276820
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 120763
<TOTAL-LIABILITIES> 397583
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3328123
<SHARES-COMMON-STOCK> 2907545
<SHARES-COMMON-PRIOR> 3046725
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (317)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 2907256
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 181678
<OTHER-INCOME> 0
<EXPENSES-NET> 7745
<NET-INVESTMENT-INCOME> 173933
<REALIZED-GAINS-CURRENT> (174)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 173759
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (156045)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 49447229
<NUMBER-OF-SHARES-REDEEMED> (49465537)
<SHARES-REINVESTED> 59129
<NET-CHANGE-IN-ASSETS> (76794)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (143)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6765
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7745
<AVERAGE-NET-ASSETS> 3017254
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .052
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.052)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .002
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000843781
<NAME> DREYFUS TREASURY PRIME CASH MANAGEMENT
<SERIES>
<NUMBER> 002
<NAME> INVESTOR SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1998
<PERIOD-END> JAN-31-1998
<INVESTMENTS-AT-COST> 3314694
<INVESTMENTS-AT-VALUE> 3314694
<RECEIVABLES> 403995
<ASSETS-OTHER> 6700
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3725389
<PAYABLE-FOR-SECURITIES> 276820
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 120763
<TOTAL-LIABILITIES> 397583
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3328123
<SHARES-COMMON-STOCK> 303644
<SHARES-COMMON-PRIOR> 358019
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (317)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 303623
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 181678
<OTHER-INCOME> 0
<EXPENSES-NET> 7745
<NET-INVESTMENT-INCOME> 173933
<REALIZED-GAINS-CURRENT> (174)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 173759
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (15583)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2579004
<NUMBER-OF-SHARES-REDEEMED> (2641415)
<SHARES-REINVESTED> 8036
<NET-CHANGE-IN-ASSETS> (76794)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (143)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6765
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7745
<AVERAGE-NET-ASSETS> 317236
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .049
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.049)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .005
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000843781
<NAME> DREYFUS TREASURY PRIME CASH MANAGEMENT
<SERIES>
<NUMBER> 003
<NAME> ADMINISTRATIVE SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1998
<PERIOD-END> JAN-31-1998
<INVESTMENTS-AT-COST> 3314694
<INVESTMENTS-AT-VALUE> 3314694
<RECEIVABLES> 403995
<ASSETS-OTHER> 6700
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3725389
<PAYABLE-FOR-SECURITIES> 276820
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 120763
<TOTAL-LIABILITIES> 397583
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3328123
<SHARES-COMMON-STOCK> 6626
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (317)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 6625
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 181678
<OTHER-INCOME> 0
<EXPENSES-NET> 7745
<NET-INVESTMENT-INCOME> 173933
<REALIZED-GAINS-CURRENT> (174)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 173759
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (89)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 23372
<NUMBER-OF-SHARES-REDEEMED> (16835)
<SHARES-REINVESTED> 89
<NET-CHANGE-IN-ASSETS> (76794)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (143)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6765
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7745
<AVERAGE-NET-ASSETS> 1741
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .051
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.051)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .003
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000843781
<NAME> DREYFUS TREASURY PRIME CASH MANAGEMENT
<SERIES>
<NUMBER> 004
<NAME> PARTICIPANT SHARES
<MULTIPLIER> 1000
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> JAN-31-1998
<PERIOD-END> JAN-31-1998
<INVESTMENTS-AT-COST> 3314694
<INVESTMENTS-AT-VALUE> 3314694
<RECEIVABLES> 403995
<ASSETS-OTHER> 6700
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 3725389
<PAYABLE-FOR-SECURITIES> 276820
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 120763
<TOTAL-LIABILITIES> 397583
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 3328123
<SHARES-COMMON-STOCK> 110308
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (317)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 110302
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 181678
<OTHER-INCOME> 0
<EXPENSES-NET> 7745
<NET-INVESTMENT-INCOME> 173933
<REALIZED-GAINS-CURRENT> (174)
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 173759
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (2216)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 438269
<NUMBER-OF-SHARES-REDEEMED> (328179)
<SHARES-REINVESTED> 218
<NET-CHANGE-IN-ASSETS> (76794)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> (143)
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 6765
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 7745
<AVERAGE-NET-ASSETS> 46308
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> .048
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (.048)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> .006
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>