Abstarct: Biologycal anzymes such as cytochrome P-450 are well known to carry out epoxidation. Biomimetic oxidations refer to oxidations carried out by relatively low molecular weight complexes which mimic biological systems in their catalytic efficiency. Biomimetic epoxidation of alkenes is a transformation of significant importance in organic synthesis. The resultant epoxides are valuable templates in the construction of a wide range of compounds via regioand stereocontrolled nucleophilic ring opening reactions. Transition mextal complexes have therefore been used to catalyze the olefin epoxidations, and some of these has been immobilized up on a range of PS-baxsed supports. In the present work, epoxidation of alkens catalyzed by [Mn(NAPdien)(OAC)]. Then this complex immobilized upon chloro methyled poly(styrene), for increase the stability, recovery and reuse. The complex anchored to the polymer via a covalent bond. The heterogeny complex, [Mn(NAPdien)(OAC)]-PS, also used in alken epoxidation that presented higher activity and selectivity when compared with the homogeneous counterpart. Both catalysts were used with NaIO4 as an oxygen donor at room temperature. This heterogeneous catalyst was highly reusable in the oxidation reactions and rused several times without significant loss of their catalytic activity. The homogeneous catalyst was charactrized by IR and UV-Vis spectroscopy and the heterogenized catalyst was characterized by elemental and thermal analysis, IR and UV-Vis spectroscopy, and scanning electron microscopy (SEM).