A　series　of　1.2%Mn-Fe/ACF　catalysts　using　MX　rejects-based　activated　carbon　fibers　as　supports　were　prepared　by　an　incipient　wetness　method　and　used　for　low-temperature　selective　catalytic　reduction　of　NO.　The　catalysts　were　characterized　by　BET,　XRD,　FESEM　and　EDX　techniques.　The　results　of　activity　tests　showed　that　the　addition　of　an　appropriate　amount　of　iron　could　improve　the　catalytic　activity　of　catalyst,　and　1.2%Mn(0.75)-Fe/ACF　catalyst　yielded　almost　92%　NO　conversion　at　200　at　a　high　space　velocity　of　56　000　h-1.　The　results　of　BET,　XRD　and　FESEM　showed　that　a　high　surface　area　and　well-dispersed　metal　oxides　on　the　surface　of　support　would　improve　the　catalytic　activity　of　catalyst.