Manganese　oxides　(MnOx)　have　attracted　increasing　attention　in　selective　catalytic　reduction　of　NOx　with　NH3　(NH3-SCR)　due　to　their　excellent　low-temperature　catalytic　activities.　However,　MnOx　still　suffer　from　poor　resistance　to　SO2　and　H2O　in　NH3-SCR.　In　particular,　the　irreversible　poisoning　of　SO2　limits　their　practical　applications　in　NH3-SCR.　With　the　new　regulations　concerning　the　emission　of　SO2　gas,　MnOx　may　be　used　for　control　over　NOx　(i.e.　NO　and　NO2)　emission　in　NH3SCR.　This　mini-review　was　devoted　to　challenges　and　opportunities　of　MnOx　catalysts　in　NH3-SCR,　which　may　be　helpful　for　its　practical　application　in　NH3-SCR　system.