Polypropylene fibers are synthetic fibers spun from isotactic polypropylene, obtained by polymerizing propylene, known as "polypropylene" in China. They can be categorized into long fibers, short fibers, spunbonded nonwovens, and meltblown nonwovens, among others. Polypropylene fibers offer high strength, good toughness, resistance to chemicals and microorganisms, and low cost, making them widely used in industries such as ropes, fishing nets, safety belts, luggage straps, safety nets, sewing threads, cable sheaths, geotextiles, filter fabrics, paper felt for papermaking, and reinforcing materials for paper. The woven geotextiles made from polypropylene fibers, which possess high strength, resistance to acids and alkalis, antimicrobial properties, and equal strength in dry and wet conditions, can reinforce civil engineering projects built on soft soil foundations (such as dams, reservoirs, highways, and railways), evenly distribute load-bearing on the geotextile, and ensure uniform settlement of the subgrade, reducing ground cracking. When constructing slopes, woven polypropylene geotextiles can stabilize the slope, reduce collapses, shorten construction time, and extend the lifespan of the slope. For heavy load-bearing applications, composite geotextiles with woven geotextiles and nonwoven as the base can be used. Polypropylene fibers can also be used as filling materials for concrete and plaster, enhancing the impact resistance and waterproof insulation properties of concrete.