Polypropylene fiber is also called anti-cracking fiber, PP fiber, building material fiber, and construction fiber. Polypropylene fiber is a high-strength bundled monofilament fiber, it is made from polypropylene. By adding the PP fiber into the mortar concrete can effectively control the micro-cracks caused by the solid plastic shrinkage, dry shrinkage, temperature change and other factors of the concrete. PP fiber prevent and inhibit the formation and development of cracks, and greatly improve the crack resistance, impermeability, impact resistance and Earthquake resistance.