The graft copolymer, consisting of a flurorinated macromer(F-macromer) and a 2-(dimethyl amino)ethyl methacrylate, were prepared by marcromonomer technique and radical copolymerization. In this study, the surface propeties of the graft copolymer and its additive effect on the surface energy of polymer film were compared with the random copolymer of poly(perfluoroalkyl ethyl acrylate)-r-poly(2-dimethylamino ethyl methacrylate)(PFA-r-P(2-DMAEMA)). The contact angles of the surface modified by the graft copolymer is large than that of random copolymer with similar FA monomer content, and surface free energy of the substrate containing 0.01wt% of the graft copolymer is similar with that of 0.1wt% random copolymer surface. That is, The low-energy modification effect of the graft copolymer is better than that of the random copolymer.