Titanium　dioxide　co-doped　with　N　and　B　was　prepared　by　sol-gel　method.　The　photocatalytic　activity　was　evaluated　by　the　photodegradation　of　methylene　blue　under　visible　light.　Its　physicochemical　properties　were　characterized　by　means　of　UV-Vis　DRS,　XRD,　FF-IR,　and　XPS.　The　results　indicated　that　N-B-TiO2　has　good　activity　to　the　photodegradation　of　MB.　Its　decolourizing　rate　of　methylene　blue　solution　goes　up　to　98.4%　under　the　visible　light　irradiation　with　5　h.　The　doping　nitrogen　forms　N-Ti-O　and　boron　primarily　existing　in　oxide　appears　in　the　N-B-TiO2　sample.　They　response　for　visible　light　of　TiO2　was　also　exploited.