Polyphenylene　sulfide　(PPS)　filter　was　firstly　treated　by　lauryl　sodium　sulfate　(SDS)　to　activate　the　surface　of　PPS.　Because　of　the　electrostatic　interaction　between　SO4-　and　H+,　the　potassium　permanganate　(KMnO4)　can　transform　into　nano　flower　of　manganese　dioxide　by　redox　reaction　on　the　surface　of　PPS.　The　as-prepared　functional　composites　were　denoted　as　nf-MnO2/PPS.　The　preparation　conditions　were　optimized　as　follows:　mass　ratio　of　KMnO4　to　PPS　was　0.5　and　reaction　time　5.5　h.　The　best　preparation　condition　was　obtained　through　studying　the　relationship　between　the　mass　ratio　of　KMnO4/PPS,　reaction　time　and　the　performance　of　the　composites.　Field　emission　scanning　electron　microscopy　(FESEM),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS),　Fourier　transform　infrared　spectroscopy　(FTIR)　and　SCR　activity　test　were　used　to　investigate　the　structure,　properties　and　the　performance　of　the　composites.　FESEM　displayed　that　flake-like　MnO2　catalyst　was　uniformly　distributed　on　the　surface　of　PPS　filter　material,　the　as-prepared　nf-MnO2　catalyst　was　coated　on　PPS　material　by　a　redox　method,　and　the　results　showed　that　all　the　composite　filter　materials　presented　excellent　SCR　activity,　and　the　conversion　of　NO　could　reach　100%　at　180　degrees　C.　In　addition,　the　above-mentioned　composite　filter　material,　denoted　as　nf-MnO2/PPy@PPS,　was　then　covered　by　a　layer　of　polypyrrole　(PPy)　composites　via　the　interfacial　polymerization　technique.　The　structure　properties　and　performance　of　nf-MnO2/PPy@　PPS　were　also　studied　using.　FESEM,　TEM,　XPS,　FTIR　and　SCR　activity　test.　Finally,　as　shown　by　SCR　activity　test,　the　nf-MnO2/PPS,　fabricated　under　the　optimized　conditions,　led　to　the　conversion　of　NO　to　36%　-100%　in　the　temperature　range　of　80　-　180　degrees　C.　The　nf-MnO2/PPy@PPS　demonstrated　higher　mechanical　strength　of　combination　and　catalytic　stability,　with　slightly　decreased　conversion　of　NO.