Abstract: A method of composing the catalyzer of Pt/MnO₂/C by electrolysis-sediment is discussed and the surface structure of Pt/MnO₂/C is observed by SEM method in this paper.The electroeatalytic performance test has been studied by CV method,and the result shows that the electrode of Pt/MnO₂/C has increased electrocatalytic activity for oxidation of methanol.The electrode of Pt/MnO₂/C,which has bigger specific surface area,can be obtained by electrolysis-sediment.