The conducting poly(methylmethacrylate-co-pyrrolylmethylstyrene)-g-poly pyrrole (PMMAPMS-g-PPy) was synthesized by the electrochemical reaction with PMMAPMS and pyrrole in the electrolyte solution containing lithium perchlorate and a mixture solvent of acetonitrile and dichloromethane. The precursor PMMAPMS was synthesized by the reaction with poly(methyl methacrylate-co-chloromethylstyrene) (PMMCMS) and potassium pyrrole salt.