Polymerization of acrylonitrile initiated by Ce(IV)-ethyleneciamine redox system in nitric acid solution at 3$0^{circ}C$ was investigated under nitrogen atmosphere. From the results of kinetic study, it was concluded that ceric ion forms a coordination complex, which is believed to be chelate. The presence of the optimum concentaration of Ce(IV) ion in the polymerization suggested that the termination of the polymerization was due to the formation of redox pair between Ce(IV) ion and polymer radical. The rate of polymerization was remarkably enhanced by the addition of ethylenediamine to the system and the order of dependence of the rate of polymerization on monomer concentration was found to be 1.7. Rate of polymerization (RP) and molecular weight of the polymer, however, decreased with increasing concentration of ethylenediamine. The activation energy was estimated to be 5.74 kcal/mol, implicating that this system is effective for the vinyl polymerization at low temperature.