[en] As a functional adaptation method for the organic silicon polysilane chemical modification is performed by the gamma ray irradiation associated with graft copolymer. The modified samples of polysilane are obtained through the control of graft rate which depends on the gamma ray irradiation conditions. The amphipathic polysilane of the graft copolymerization product becomes an ultra thin membrane at the surface of the solvent. The texture of the membrane depends on the rate of the graft copolymerization. The results show that the gamma ray associated graft copolymerization is one of the effective methods for the functional adaptation to the polysilane. (H. Katsuta)