Polypropylene fibers are synthetic fibers made from isotactic polypropylene, derived from propylene polymerization, known as "polypropylene" in our country. They can be categorized into long fibers, short fibers, spunbonded nonwovens, and meltblown nonwovens, among others. Polypropylene fibers boast high strength, good flexibility, resistance to chemicals and microorganisms, and low cost, making them widely used in industries such as ropes, fishing nets, seat belts, bag straps, safety nets, sewing threads, cable sheathings, geotextiles, filter cloths, paper felt, and reinforcing materials for paper. The woven geotextiles made with the excellent properties of polypropylene fibers, such as high strength, resistance to acids and alkalis, antimicrobial properties, and equal strength in both wet and dry conditions, can reinforce civil engineering structures built on soft soil foundations (such as dams, reservoirs, highways, railways, etc.), evenly distributing load-bearing pressure on the geotextile, ensuring uniform settlement of the subgrade, and reducing ground cracking. When constructing slopes, woven polypropylene geotextiles can stabilize the slope, reduce the risk of slope failure, shorten construction time, and prolong the slope's service life. For larger load-bearing applications, composite geotextiles with woven and nonwoven bases can be used. Polypropylene fibers can also serve as filling materials for concrete, plaster, and others, enhancing the impact resistance and waterproof thermal insulation properties of concrete.