The characteristics of copolymerization of α-pinene and styrene with the catalyst system SbCl 3/AlCl 3 have been investigated. The characteristics were effected in changing the concentrations and the preparation methods of catalyst

feeding monomer ratio and solvent. And the copolymerization products were determined. The results have shown that the activity ratio between styrene and α-pinene was reduced greatly and the copolymerization products were obtained with this catalyst system. The molecular weight of copolymerization products was higher in the toluene

high feeding ratio of styrene and with solid type catalyst than in other conditions. The characteristics of polymerization of styrene with this catalyst system have been also investigated. The results have shown that the characteristics of this catalyst system for polymerization of styrene were different from those of for polmerization of α-pinene.