Three　V2O5/TiO2　catalysts　with　V2O5　loading　of　3　wt%　were　fabricated　by　wet　impregnation,　in　which　the　TiO2　supports　had　different　crystal　types,　including　the　octahedral　TiO2　(preferentially　exposed　anatase　{101}　facets,　labeled　as　TiO2-O),　the　sheet　TiO2　(preferentially　exposed　anatase　{001}　facets,　labeled　as　TiO2-S),　and　the　commercial　TiO2　(TiO2-P25),　giving　the　three　corresponding　catalysts,　respectively.　The　activities　and　the　effects　of　H2O　and　SO2　over　the　V2O5/TiO2　catalysts　for　the　selective　catalytic　reduction　(SCR)　of　NO　by　NH3　were　investigated.　It　was　found　that　the　crystal　facets　of　TiO2　nanoparticles　played　an　essential　role　in　the　catalytic　activity.　The　V2O5/TiO2-S　catalyst　exhibited　the　better　catalytic　activity　than　the　V2O5/TiO2-O　and　V2O5/TiO2-P25　catalysts　for　the　NH3-SCR　reaction.　The　N-2　sorption　isotherm　measurement　(BET),　X-ray　diffraction　(XRD),　scanning　electron　microscope　(SEM),　transmission　electron　microscopy　(TEM),　temperature-programmed　reduction　(H-2-TPR),　temperature-programmed　desorption　(NH3-TPD),　X-ray　photoelectron　spectra　(XPS)　and　in-situ　diffuse　reflectance　Fourier　transform　infrared　spectroscopy　(DRIFTS)　characterizations　showed　that　the　good　dispersion　and　reducibility　of　vanadium　species,　and　the　high　concentration　of　chemisorbed　oxygen　of　the　V2O5/TiO2-S　catalyst　could　be　responsible　for　the　enhancement　in　the　activity　of　NH3-SCR　reaction　over　the　catalyst.