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This paper reports on the spinning of nanofiber on the surface of car cabin air filter to enhance its filtration performance. Three car cabin air filters with difference average fiber diameter were used as the samples. Polyacrylonitrille (PAN) nanofiber were deposited on the cabin air filter by electrospinning technique. PAN powder was dissolved with N,N dimethylformamide (DMF) with the concentration of 9 wt.%. The solution properties of PAN nanofiber, including viscosity and surface tension, and the average fiber diameter were characterized. The air filtration performance of cabin air filter before and after nanofiber enhancement were analyzed. The filtration performance, including pressure drop, efficiency and quality factor were measured. From the result, the cabin fiber diameter is strongly influenced the air performance filter.