Spinning solution was prepared using polyacrylonitrile(PAN) as solute and N,N-dimethylformamide(DMF) as solvent with concentration of 10%.PAN nanofibers non-woven of which the diameter range is from 200 nm to 280 nm was prepared under conditions of 18 kV spinning voltage,3.0 mL / h injection speed and 15 cm receiving distance.And PAN nanofibers non-woven was cured at 280 ℃ in air and pyrolyzed at 850 ℃ in nitrogen,the light and flexible carbon nanofibers non-woven was obtained with the diameter range from 1...