The cationic Polyurethane/Polyacrylate composite emulsion was prepared by HDI, PTMG1000, N-MDEA, styrene (St), butylacrylate (BA), Hydroxyethyl acrylate (HEA). The effects of the content of HEA, MDEA, and Polyacrylate on performance of the films were investigated. And it was characterized by the method of IR, TGA. When w (HEA) = 6%, w (MDEA) = 6%, w(Polyacrylate)=40%, the coating can achieve the optimize performance. The results showed that water absorption was 9.26 %, the tensile strength was 35.6MPa, the elongation at break was 337%.