  We use a rotatable torsion balance to perform an equivalence principle test
on a magnetically shielded spin-polarized body of HoFe_{3}. With a rotation
period of one hour, the period of possible signal is reduced from one solar day
by 24 times, and hence the 1/f noise is greatly reduced. Our present
experimental results gives a limit (0.25 +- 1.26) X 10^{-9} on the Eotvos
parameter \eta of equivalence of the polarized body compared with unpolarized
aluminium-brass cylinders in the solar gravitional field, and a limit (0.34 +-
0.52) X 10^{-9} in the earth gravitional fields. This improves the previous
limit on polarized bodies by a factor of 45 for solar field and by a factor of
11 for earth field.
