  The polarized distribution functions of mesons, including pion, kaon and eta,
using the proton structure function, are calculated. We are looking for a
relationship between the polarized distribution of mesons and the polarized
structure of nucleons. We show that the meson polarized parton distributions
leads to zero total spin for the concerned mesons, considering the orbital
angular momentum of quarks and gluons inside the meson. Two separate Monte
Carlo algorithms are applied to compute the polarized parton distributions of
the kaon. Via the mass dependence of quark distributions, the distribution
function of the eta meson is obtained. A new method by which the polarized sea
quark distributions of protons are evolved separately -- which cannot be
performed easily using the standard solution of DGLAP equations -- is
introduced. The mass dependence of these distributions is obtained, using the
renormalization group equation which makes their evolutions more precise.
Comparison between the evolved distributions and the available experimental
data validates the suggested solutions for separated evolutions.
