To photocatalytic decomposition of methylene blue waste water, Pt nanoparticles modified TiO2 films were prepared via the electrostatic self-assembly. The photocatalysts were characterized by TEM, FESEM and XRD. The results showed that metallic Pt nanoparticles had been highly dispersed on TiO2 films. The space between adjacent carbon fibers still remained unfilled after Pt-TiO2 coating, into which UV light and polluted solutions can penetrate to form a three-dimensional environment for the photodegradation. The photocatalysts could rapidly degrade the polluted methylene blue water, with the combined adsorption and degradation processes.