  The results of our new QCD analysis of helicity parton distributions of the
nucleon at full next-to-leading order (NLO) accuracy in the fixed-flavor number
scheme will be presented. Performing a combined QCD fit on the global sets of
latest inclusive and the semi-inclusive polarized deep inelastic scattering
data, we are able to extract new polarized parton distribution functions
(PPDFs) at the input scale $Q_{0}^2=1$ GeV$^2$. Particulary, we have calculated
PPDFs considering light sea-quark decomposition and the results are compared
with the experimental data and the most precise theoretical models obtained by
recent analyses. The latest COMPASS2010 SIDIS data, which were not available
for the previous analyses, are employed in the current analysis and the effect
of COMPASS SIDIS data is studied in detail. Also the uncertainties of PPDFs are
determined using the standard Hessian technique.
