Pt-doped TiO 2 and N-doped TiO 2 were prepared, using nanotubular titanic acid as precursor, by wet impregnation and NH 3 -heating method, respectively. Both Pt-doped and N-doped TiO 2 show an apparent photocatalytic oxidation of propylene under visible light irradiation. The origin of visible light sensitization was ascribed to the intra-band contributed by the formation of single-electron-trapped oxygen vacancies, while dopants platinum or nitrogen play a role not only in suppressing the recombination of photoinduced electrons and holes but also in increasing the ability of visible light absorption of TiO 2 . The visible light photocatalytic activity of Pt-doped TiO 2 can be greatly improved by additional infrared light irradiation, while visible-light-active N-doped TiO 2 has no such phenomenon. Infrared light per se is unable to excite Pt-doped TiO 2 catalyst to initiate photocatalytic reaction, but the strong interaction between platinum and oxygen vacancies resulted in absorption peaks at 800–900nm, resulting in a giant enhancement in visible light photocatalytic activity of Pt-doped TiO 2 in the presence of infrared light irradiation because the formed heterojunctions between dopants Pt and TiO 2 may function as thermal catalytic sites. The influences of reaction temperatures on visible light photoactivity of both Pt-doped and N-doped TiO 2 were studied. It was found that both C 3 H 6 removal and CO 2 selectivity over Pt-doped TiO 2 were increased with increasing the reaction temperature, while it was inert for N-doped TiO 2 .