With anatase nanometer TiO2 titanium modified by anionic surfactant SDS, different rates are mixed with PVA to prepare PVA/ TiO2 compound film by steel strip. The structure of the film is characterized by FT-IR, and the mechanical properties, permeability and light transmission rate of composite membrane are tested. The result shows that complex film has better performance, and with increasing of nanometer TiO2, the rate of UV transmission decreases obviously.