The　catalyst　is　a　key　to　the　selective　catalytic　reduction　(SCR)　technique　to　remove　NOx　from　effluent　gas,　the　active　component　and　the　support　directly　determine　the　low-temperature　activity　of　catalysts.　Recently,　Mn-based　De-NOx　catalyst　had　become　a　research　focus　in　the　field　of　flue　gas　catalytic　denitrification,　a　large　number　of　Mn-based　catalysts　have　been　developed,　and　its　denitration　performance,　water-resistance　as　well　as　sulfur　resistance　were　severely　influenced　by　additives　and　supports.　In　this　paper,　the　research　progress　of　Mn-based　catalysts　with　different　supports　was　presented.　Besides,　the　perspective　of　carbon　nanotubes　for　the　support　of　Mn-based　catalysts　is　also　summarized.