The polymerization kinetics of 4,4’-biphenyldicarbonitrile catalyzed by complex of 4,4’-biphenyl-dicarbonitrile with ZnCl_2 was studied. The cyano group concentration was measured by infrared spectroscopic analysis using potassium ferricyanide as the internal reference. The results proved that the polymerization is a second order reaction, and the activation energy of polymerization is 12.4 kcal/mol. The polymerization rates of 4,4’-biphenyldicarbonitrile catalyzed by other seven complexes were also measured. The polymerization mechanism was discussed. The polymerization kinetics of 4,4’-biphenyldicarbonitrile catalyzed by complex of 4,4’-biphenyl-dicarbonitrile with ZnCl_2 was studied. The cyano group concentration was measured by infrared spectroscopic analysis using potassium ferricyanide as the internal reference. The results proved that the polymerization is a second order reaction, and the activation energy of polymerization is 12.4 kcal / mol. The polymerization rates of 4,4’-biphenyldicarbonitrile catalyzed by other seven complexes were also measured. The polymerization mechanism was discussed.