<TABLE> <S> <C>
<ARTICLE> 5
<LEGEND>
The schedule contains summary financial information extracted from Dean
Witter Principal Plus Fund L.P. and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> SEP-30-2000
<CASH> 4,117,961
<SECURITIES> 37,268,041
<RECEIVABLES> 20,166
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 0
<DEPRECIATION> 0
<TOTAL-ASSETS> 40,894,102<F1>
<CURRENT-LIABILITIES> 0
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 0
<TOTAL-LIABILITY-AND-EQUITY> 40,894,102<F2>
<SALES> 0
<TOTAL-REVENUES> 1,927,466<F3>
<CGS> 0
<TOTAL-COSTS> 0
<OTHER-EXPENSES> 1,734,039
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 286,305<F4>
<INCOME-TAX> 0
<INCOME-CONTINUING> 286,305<F4>
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 286,305<F4>
<EPS-BASIC> 0
<EPS-DILUTED> 0
<FN>
<F1>In addition to cash, securities and receivables and interest receivable,
total assets include net unrealized loss on open contracts of $186,648 and
net option premiums of $(139,500).
<F2>Liabilities include redemptions payable of $2,246,208, accrued
brokerage fees of $136,358, accrued administrative fees of
$172,749, accrued management fees of $34,089.
<F3>Total revenues include realized trading revenue of $(139,415), net
change in unrealized of $(567,384), interest income of $1,801,793 and
change in valuation of Yield Pool of $832,472.
<F4>Income-Pretax, Income Continuing and Net Income includes minority
interest in income of $(92,878).
</FN>
</TABLE>
