By　using　domestic　aramid　fiber　1313　and　glass　fiber　as　main　raw　materials,　the　composite　needled　felts　were　prepared　by　reasonable　structure　design,　process　optimization　and　advanced　non-woven　needle　technology,　of　which　the　process　included　high　temperature　heat-setting,　singeing,　calendering,　acid-resisting　treatment,　and　so　on.　The　wearability,　bursting　strength,　acid-resistance　and　filtration　performance　were　characterized;　it　is　found　that　the　compound　filter　materials　have　excellent　acid-resistance,　filtering　precision,　abrasion　resistance　and　high　performance-cost　ratio.　The　scanning　electron　microscope　(SEM)　photos　show　that　the　surface　of　composite　filters　is　coated　with　polytetrafluoroethylene　(PTFE),　improving　chemical　resistance　and　friction　coefficient　of　filter　materials.