The　influence　of　Pt　as　a　promoter　on　the　photocatalytic　performance　of　nitrogen-doped　TiO2　was　described.　The　sample　was　characterized　by　X-ray　diffraction,　transmission　electron　microscopy,　X-ray　photoelectron　spectroscopy,　UV-Vis　diffuse　reflectance　spectroscopy,　photoelectrochemistry,　and　photoluminescence.　The　degradation　of　methyl　orange　in　aqueous　solution　under　visible　light　irradiation　was　used　to　evaluate　the　photocatalytic　activity　of　the　sample.　The　modification　of　N-TiO2　with　Pt　did　not　change　the　crystal　structure　and　the　mesoporous　structure　of　TiO2.　The　loading　of　Pt　enhanced　the　material　absorption　in　visible　light　region,　which　is　assigned　to　background　absorption　that　has　detrimental　effect　on　photocatalytic　activity.　However,　the　highly　dispersed　Pt　on　the　surface　of　N-TiO2　remarkably　altered　the　surface　structure　(surface　state)　of　N-TiO2,　contributing　largely　to　the　enhanced　photocatalytic　activity　of　nitrogen-doped　TiO2.