Polyacrylonitrile fiber /PAN fiber is a fiber product used for cement and asphalt concrete reinforcement. Polyacrylonitrile fiber has higher tensile strength, better ultraviolet resistance, high temperature and cold resistance than polypropylene fiber, which can significantly reduce the early cracking of cement concrete and enhance the anti-seepage performance. It can significantly improve the toughness and strength of cement concrete, enhance its anti freezing ability and prolong its service life. The product is used in asphalt concrete and can improve the high-temperature stability, low-temperature crack resistance and durability of asphalt concrete. The multi-purpose of klebo polyacrylonitrile fiber in concrete has attracted extensive attention in the industry.