Photo-polymerization kinetics of acrylate monomer initiated by bis [2-(ochlorophenyl)-4,5-diphenylimidazole] compound photo-initiator system were investigated by real-time infrared (RT-IR), while NMR and UV was used for characterization, respectively. In synthetic system BCIM was used as pho-to-initiator, N, N-bis(diethylamino) benzophenone (EMK) was used as photo-sensitizer and N-phenylglycine (NPG) was used as hydrogen donor. The kinetics was determined by real-time infrared (RT-IR). The results showed that the polymerization rate and the double bond conversion increased with the initiator concentration while the mass ratio m(BCIM): m(EMK): m(NPG) was 10: 5: 5. The optimum initiate efficiency of 96.7% and the polymerization rate of above 90% with diacrylate monomer were better than that with triacrylate monomer. It was also found that the polymerization rate could increase with light intensity.Cited