Geomembrane is a plastic film made from polyethylene resin particles as raw materials; Composite geotextile refers to a composite geotextile made of two fabrics, one membrane or one fabric, one membrane, also known as anti-seepage geotextile. It is composed of geotextile and geotextile through a thermal composite process or a coating machine. The common ground between the two is anti-seepage and isolation. The two have different purposes, with geotextile membranes being more widely used, while composite geotextile membranes are mostly used in artificial lakes, landfills, water storage tanks, and other projects; Composite geomembrane has two or one side of cloth to protect the geomembrane, which can increase the stability and safety of the project.