Polyphenylene　sulfide(PPS)　filter　was　pre-treated　with　HNO3,　H2SO4,　HCl　and　NaOH.　The　effects　of　pre-treating　on　properties　and　selective　catalytic　reduction(SCR)　catalytic　activity　of　PPS　filter　were　studied.　Fourier　transform　infrared　spectrometer(FT-IR)　shows　that　the　surface　of　PPS　filter　only　treated　with　HNO3　is　oxidized　dramatically.　The　results　of　differential　scanning　calorimetry　and　thermogravimetry　indicate　that　PPS　filter　treated　with　H2SO4,　HCl　and　NaOH　still　has　favorable　thermal　stability　while　the　thermal　stability　of　PPS　filter　treated　with　HNO3　decreases.　The　SCR　catalytic　activities　of　PPS　filter　were　tested　at　lower　temperature.　The　results　show　that　the　SCR　catalytic　activities　of　PPS　filter　treated　with　H2SO4,　HCl　and　NaOH　increase,　while　those　of　PPS　filter　treated　with　HNO3　decrease.