Composite geotextile is commonly used for anti-seepage treatment of dams, drainage ditches, and anti fouling treatment of waste sites. Function: anti-seepage and isolation purposes: geotechnical dams, rock fill dams, masonry dams, and compression concrete dams; Horizontal anti-seepage blanket in front of embankments and dams, and vertical anti-seepage layer on the foundation; Tailings dam, sewage storage dam body and storage area; Construction cofferdam; The widespread application of composite geomembranes in channels and reservoirs has also played a protective role in the ecological environment.