The purpose of this study is to investigate acrylic oligomer with excellent flexibility which can be used as a photocurable crosslinking agent. In this study, the acrylate oligomer with the epoxy group was synthesized by free radical polymerization of butyl acrylate (BA) and glycidyl methacrylate (GMA) as reactants. Also, the acryl-modified oligomer with hydroxyl group was synthesized by the reaction of acrylic acid with the epoxy-containing oligomer. Various acryl-modified acrylate oligomers were prepared by changing the concentration of GMA and employing different acrylate monomers such as hexyl acrylate and octyl acrylate with different chain lengths. Photo-cured films were prepared from the synthesized acryl-modified oligomers, reactive diluents, and photoinitiator. And the corresponding curing degree, thermal properties and mechanical properties of the cured film were investigated.