Compounded watertight plank/ composite geomembrane is made of various plastic watertight plank/ film and cloth (needle punched geotextiles, filament machine woven cloth and plastic woven cloth) by means of advanced laminating technology. The main types include one layer of cloth and one layer of film, double layers of cloth and one layer of film, and multilayer of cloth and multilayer of film. It is strong, anti-seepage, breaking strength, and easy to use and control. Also, it is applicable whether the temperature is high or low.