In　recent　years,　low-temperature　SCR　(Selective　Catalytic　Reduction)　denitrification　technology　has　been　popularized　in　non-power　industries　and　has　played　an　important　role　in　the　control　of　industrial　flue　gas　NOx　emissions　in　China.　Currently,　the　most　commonly　used　catalysts　in　industry　are　V2O5-WO3(MoO3)/TiO2,　MnO2-based　catalysts,　CeO2-based　catalysts,　MnO2-CeO2　catalysts　and　zeolite　SCR　catalysts.　The　flue　gas　emitted　during　industrial　combustion　usually　contains　SO2,　moisture　and　alkali　metals,　which　can　affect　the　service　life　of　SCR　catalysts.　This　paper　summarizes　the　mechanism　of　catalyst　poisoning　and　aims　to　reduce　the　negative　effect　of　NH4HSO4　on　the　activity　of　the　SCR　catalyst　at　low　temperatures　in　industrial　applications.　It　also　presents　the　outstanding　achievements　of　domestic　companies　in　denitrification　in　the　non-power　industry　in　recent　years.　Much　progress　has　been　made　in　the　research　and　application　of　low-temperature　NH3-SCR,　and　with　the　renewed　demand　for　deeper　NOx　treatments,　new　technologies　with　lower　energy　consumption　and　more　functions　need　to　be　developed.