Abstract: The treatment of resist water and oil by low-temperature plasma technology for recycled polyester fiber (PET) automotive interior carpet was studied. The best process conditions were optimized: low-temperature plasma processing power was 150W, dealing with vacuum was 30Pa，processing time 10 min, C8H2F17NO2S monomer concentration was 15%.The performance testing and analysis for the after finishing PET interior carpet using the optimum process through contact angle measurement instrument, scanning electron microscopy and infrared spectroscopy.The result showed: there was cross-linked esterification between C8H2F17NO2S monomer and PET molecules,fiber surface had some C-F groups with low surface energy. Namely, C8H2F17NO2S monomer was effectively grafted onto the surface of PET fiber, sequentially,the automotive interior carpet had a better effect to resist water and oil.