Geotextile, also known as geotextile fabric, is a permeable geotechnical synthetic material made from **polypropylene (PP) or polyester (PET)** as raw materials through processes such as needle punching and spun bonding. It is widely used in fields such as geotechnical engineering, water conservancy and transportation, and municipal environmental protection, and is an indispensable new type of building material in modern infrastructure construction.