Inherent intrinsic characteristics of carbon fiber (carbon fiber), as the name implies, it not only has a carbon material, and both soft and workability of textile fibers, is a new generation of reinforcing fibers. Compared with the conventional glass fiber (GF), the Young's modulus is more than three times; Compared with Kevlar fiber (KF-49), only the Young's modulus is about 2 times, and in an organic solvent , acid, alkali insoluble expansion, excellent corrosion resistance. Some scholars in 1981 to PAN-based CF soaked in alkali NaOH solution, the time has past 30 years, it still maintains the fiber morphology.