The PPS needle nonwoven filter were treated by singeing, calendaring, dipping and covering with PTFE membrane. Their structure and property were studied. The results showed that the thickness of filter was decreased and their weight was increased by finishing. Their surface structure became denser after being treated. The pore diameter and filtration resistance of the filter were increased by finishing. The filtration efficiency of the filter was largely improved by finishing, especially covering with the PTFE membrane.