Carbon fiber is a new generation of reinforced fiber, which not only has the inherent characteristics of carbon materials, but also has the softness and machinability of textile fibers. Compared with the traditional glass fiber (GF), the Young's modulus is increased by more than three times. Compared with Kevlar fiber (KF-49), it not only has Young's modulus about twice as high as KF-49, but also is insoluble and does not swell in organic solvents, acids and alkalis, and has outstanding corrosion resistance.