Nylon 6 film was graft copolymerized with acrylamide(Am) using ceric salt as an initiator. After nylon 6 was immersed in ceric ammonium sulphate(CAS)-sulfuric acid aqueous solution, the graft yield maxima was obtained when monomer was added at 5-10 minute, Grafting rate, Rp, was proportioned to [CAS]0.69 and [Am]0.87. The thickness of film increased with the graft yield, and it was shown by IR analysis that the PAm was mainly grafted onto the surface of film, and the corrected crystallinities of grafted copolymers obtained by DSC were similar to that of original nylon 6.