<PAGE> PAGE 1
000 A000000 02/28/97
000 C000000 0000055626
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 KEYSTONE MID-CAP GROWTH FUND (S-3)
001 B000000 811-100
001 C000000 6173383200
002 A000000 200 BERKELEY STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
002 D020000 5034
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007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A000001 KEYSTONE INVESTMENT MANAGEMENT CO.
008 B000001 A
008 C000001 801-8327
008 D010001 BOSTON
008 D020001 MA
008 D030001 02116
008 D040001 5034
010 A000001 KEYSTONE INVESTMENTS, INC.
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
010 C040001 5034
011 A000001 KEYSTONE INVESTMENT DISTRIBUTORS CO.
011 B000001 8-395
011 C010001 BOSTON
011 C020001 MA
011 C030001 02116
011 C040001 5034
<PAGE> PAGE 2
012 A000001 EVERGREEN KEYSTEON SERVICE COMPANY
012 B000001 84-1571
012 C010001 BOSTON
012 C020001 MA
012 C030001 02116
012 C040001 5034
013 A000001 KPMG PEAT MARWICK LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02110
015 A000001 STATE STREET BANK & TRUST CO.
015 B000001 C
015 C010001 QUINCY
015 C020001 MA
015 C030001 02171
015 E010001 X
018 000000 Y
019 A000000 Y
019 B000000 36
019 C000000 KEYGROUPPA
020 A000001 MERRILL LYNCH
020 C000001 21
020 A000002 KOKUSAI SECURITIES CO
020 C000002 18
020 A000003 MONTGOMERY SECURITIES CO
020 C000003 16
020 A000004 INSTINET CORP
020 C000004 15
020 A000005 PAINE WEBBER INC
020 C000005 13
020 A000006 TOYO TRUST
020 C000006 11
020 A000007 SANTADER INC. BAN
020 C000007 11
020 A000008 SMITH BARNEY
020 C000008 9
020 A000009 CJLAWRENCE DEUTSCHE BA
020 C000009 9
020 A000010 INTERSTATE/JOHNSON LANE
020 C000010 9
021 000000 242
022 A000001 GOLDMAN SACS
022 B000001 13-5708880
022 C000001 302077
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022 C000003 13046
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<PAGE> PAGE 3
022 A000004 MERRILL LYNCH PIERCE FENNER
022 C000004 3832
022 D000004 9093
022 A000005 BEAR STEARNS
022 C000005 578
022 D000005 8696
022 A000006 PAINE WEBBER INC
022 C000006 57
022 D000006 8268
022 A000007 ALEX BROWN & SONS, INC.
022 C000007 4428
022 D000007 1089
022 A000008 SALOMAN BROS
022 C000008 2815
022 D000008 2380
022 A000009 THE CHICAGO CORP
022 C000009 4967
022 D000009 0
022 A000010 COWN & COKNESS & HILL
022 C000010 4704
022 D000010 0
023 C000000 2258738
023 D000000 60440
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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SIGNATURE J. KEVIN KENELY
TITLE VP FUND ADMIN
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ACCOUNTING
RECORDS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH ACCOUNTING
RECORDS.
</LEGEND>
<SERIES>
<NUMBER> 101
<NAME> KEYSTONE MID-CAP GROWTH FUND CLASS A
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1996
<PERIOD-START> SEP-01-1995
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 262,933,930
<INVESTMENTS-AT-VALUE> 300,600,519
<RECEIVABLES> 342,173
<ASSETS-OTHER> 43,658
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 301,013,692
<PAYABLE-FOR-SECURITIES> 3,183,992
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 618,655
<TOTAL-LIABILITIES> 3,802,647
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 251,719,937
<SHARES-COMMON-STOCK> 33,927,441
<SHARES-COMMON-PRIOR> 31,173,078
<ACCUMULATED-NII-CURRENT> 14,471,942
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (6,647,138)
<ACCUM-APPREC-OR-DEPREC> 37,666,304
<NET-ASSETS> 297,211,045
<DIVIDEND-INCOME> 898,765
<INTEREST-INCOME> 481,939
<OTHER-INCOME> 0
<EXPENSES-NET> (2,000,789)
<NET-INVESTMENT-INCOME> (620,085)
<REALIZED-GAINS-CURRENT> 8,420,764
<APPREC-INCREASE-CURRENT> 11,404,420
<NET-CHANGE-FROM-OPS> 19,205,099
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (31,744,864)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,602,996
<NUMBER-OF-SHARES-REDEEMED> (4,135,050)
<SHARES-REINVESTED> 3,286,417
<NET-CHANGE-IN-ASSETS> 11,836,737
<ACCUMULATED-NII-PRIOR> 15,092,027
<ACCUMULATED-GAINS-PRIOR> 16,676,962
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> (967,193)
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (2,010,454)
<AVERAGE-NET-ASSETS> 299,095,368
<PER-SHARE-NAV-BEGIN> 9.15
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 0.62
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.99)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 8.76
<EXPENSE-RATIO> 1.58
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
