Geosynthetics is a new type of construction material made of synthetic materials and used in water conservancy projects. It has been widely used in various fields of water conservancy, highway, railway, port, construction and other projects. At present, polyester fiber, polypropylene fiber, polyamide fiber and polyvinyl alcohol fiber are commonly used at home and abroad to make geosynthetics, forming eight series of products, such as: geotextile, geomembrane, geonet, geogrid, Geotechnical mats, geocells, geocomposites and related products, etc. Among them, geomembrane is one of the earliest and most widely used products in geosynthetics. Geomembrane is a relatively impermeable polymer sheet used for seepage prevention and gas transportation along the way and in civil engineering; geocomposite materials are used A composite of two or more geosynthetics artificially combined, used for drainage, water interception and reinforcement, etc.