2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41657We calculated the polarized parton distributions in leading order approximation in QCD from valon model. Polarized structure function of the nucleon are analyzed in the polarized valon model in which a nucleon is assumed to be a bound state of three polarized valence quark cluster(valons). It is shown that the results of the model calculation agree rather well with the SMC and available experimental data . Our results for $Γ_{1}$ of hadron and deuteron are in good agreement with experimental data for some value of $Q^{2}$.16 pages, latex, 7 figuresHigh Energy Physics - Phenomenologytext