  Considering a fixed-flavor number scheme and based on laplace transdormation,
we perform a leading-order and next-to-leading-order QCD analysis which are
including world data on polarized structure functions $g_1$ and $g_2$. During
our analysis, taking the DGLAP evolution, we employ the Jacobi polynomials
expansion technique. In our recent analysis we utilize the recent available
data and consequently include more data than what we did in our previous
analysis. we obtain good agreements between our results for the polarized
parton densities and nucleon structure functions with all available
experimental data and some common parametrization models.
