Abstract: One step method of irradiation and graft in liquid with XeCl excimer laser was applied to the graft of acrylamide onto PET film surface in order to improve surface hydrophilicity of PET.Water contact angle was measured to characterize surface hydrophilicity after treatment.The results show that laser irradiation and graft polymerization improve film surface hydrophilicity significantly.Laser dose,weight content of monomer solution,photosensitizer,retardant and pH of solution were found to influence graft reaction.