A synthesis and photo-cure properties of biphenyl epoxy modified photo-polymer(YX-4000H/MA) were studied. A biphenyl moiety were introduced to methacrylate type photo-polymer systems in order to increase heat resistance and transparency of them. The double bond peak intensity changes of this photo-polymer were measured using FT-IR spectroscopy to obtain photo-cure conversion. Photo-cure properties of this photo-polymer according to the addition of DPHA as cross-linking agent were investigated. The photo-cure rate of YX-4000H/MA with DPHA is faster than that without DPHA. However, a cure conversion of this resin with DPHA shows lower conversion than that without DPHA. This photopolymer systems represent n-th order cure kinetics irrespective of addition of DPHA, and kinetic parameters of these systems can be obtained and summarized.