The　effects　of　V2O5　loading,　the　volume　fractions　of　O2,　NO,　SO2　and　H2O,　n(NH3)/n(NO),　gas　hourly　space　velocity　and　online　heat　regeneration　on　NO　conversion　of　V2O5-WO3/TiO2　catalyst　prepared　by　impregnation　method　were　investigated.　Combined　with　the　experimental　results,　3%　V2O5　was　selected　as　the　optimal　loading,　and　NO　conversion　of　3%　V2O5-WO3/TiO2　catalyst　was　93.7%　at　160　℃.　The　selectivity　of　N2　was　more　than　98%　and　SO2　oxidation　was　less　than　1%　in　the　range　of　110-320　℃.　NO　conversion　of　catalyst　increased　with　the　increase　of　the　volume　fraction　of　O2,　and　decreased　with　the　increase　of　the　volume　fraction　of　NO,　however,　the　NOx　removal　amount　gradually　increased.　When　n(NH3)/n(NO)≤1,　the　optimal　activity　of　catalyst　equalled　the　respective　n(NH3)/n(NO),　and　when　n(NH3)/n(NO)>1,　the　activity　was　barely　improved.　With　the　increase　of　the　space　velocity,　the　high　activity　temperature　range　of　the　catalyst　was　narrowed,　and　the　activity　decreased　in　varying　degrees.　The　characterization　results　show　that　the　morphology　of　catalyst　is　blurred　and　the　surface　covered　with　irregular　flocs,　specific　surface　area　and　pore　volume　decrease　in　different　degrees,　and　tiny　pores　are　preferred　to　be　blocked　after　selective　catalytic　reduction　(SCR)　reaction　containing　SO2　and　H2O.　The　contents　of　V2O5　are　reduced　0.98%　and　WO3　reduced　1.6%,　the　side　reaction　products　include　NH4　+　and　SO4　2-.　During　the　process　of　online　heat　regeneration,　catalyst　delayed　the　decomposition　of　ammonium　sulfate,　which　caused　the　catalyst＇s　resistance　to　poisoning　to　be　worse　and　the　activity　was　difficult　to　be　recover.　©　2019,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.