Chopped carbon fiber refers to the carbon fiber with high strength and high modulus is processed into bundles according to the application, and then cut according to the specified length. It is mainly used as a reinforced composite material for thermoplastic resins. Compared to carbon fiber filament, it can be more evenly dispersed in the base material. Chopped carbon fiber not only has ultra-high mechanical strength, low density and good thermal stability, but also is an excellent conductive material, which is an ideal filler to improve the electrical conductivity, mechanical properties and thermal conductivity of polymer materials.