Ceria-based　catalysts(CeTiOx-A　and　CeTiOx-B)　were　prepared　by　solid　state　ball　milling　method　with　Ce-2(C2O4)(3)　and　Ce(SO4)(2)　as　precursors　,　respectively.　Then,　the　prepared　ceria-based　catalysts　were　treated　in　reaction　atmosphere　consisted　of　0.　15%　SO2　for　40　and　60　h　,　respectively.　The　obtained　catalysts　were　designated　as　40CeTiO(x)-A　,　60CeTiO(x)-A　,　40CeTiO(x)-B　and　60CeTiO(x)-B.　The　performances　of　fresh　and　used　catalysts　for　selective　catalytic　reduction(SCR)　of　NO　with　NH3　as　the　reductant　were　investigated.　The　catalysts　were　also　characterized　using　X-ray　diffraction(XRD)　,　X-ray　fluorescence　spectra　(XRF),　Brunner　emmet　teller(BET)　,　H-2-temperature　programmed　reduction(H-2-TPR)　,　X-ray　photoelectron　spectra(XPS)　,　NH3-temperature　programmed　desorption(NH3-TPD)　and　SO2-temperature　programmed　desorption(SO2-TPD)　techniques.　The　results　indicated　that　the　NH3-SCR　activity,　SO2　and　H2O　resistance　over　the　CeTiOx-A　catalysts　were　better　than　over　the　CeTiOx-B　samples.　The　reasons　14　this　phenomenon　are　that　CeTiOx-A　catalysts　possess　larger　specific　surface　area　and　pore　volume　than　CeTiOx-B　catalysts.　Besides,　CeTiOx-A　catalysts　have　plenty　of　Ce　(3+)　and　the　surface　adsorbed　oxygen,　which　would　benefit　the　adsorption　and　activation　of　NO.　Furthermore,　CeTiOx-A　catalysts　also　have　numerous　strong　Lewis　acid　sites,　which　lead　to　the　increasing　adsorption　of　NH3.　Therefore,　the　NH3-SCR　reaction　rate　and　the　NO　conversion　of　CeTiOx-A　catalysts　was　improved.