  Requiring the positivity and counting rule, we propose a new parametrization
of the polarized parton distribution which reproduce the data well. We found
that the NLO analysis is absolutely necessary to extract the correct
information on the polarized gluon distributions. The calculated results of
$x\Delta d_v(x)$ and $\Delta d_v(x)/d_v(x)$ seem to be consistent with the SMC
data at $Q^2=$10GeV$^2$.
