Radical copolymerization of Maleic anhydride with Methylmethacrylate was carried out in a Batch reactor. Solvent and initiator used were DMF and AIBN, respectively. Reaction volume was 500 litters, polymerization time 10 hours and polymerization temperature 60∼90℃. The copolymerization conversions were analyzed by FT-IR, UV, viscometer, and confirmed by measuring the solid weights of copolymers obtained after remopved solvent. The monomer reactivity ratios were determined by the Helen T d s method.