Thermoplastic polyolefin (TPO) waterproof sheet membrane is a kind of polymer waterproof material, which is made of the advanced processing technology. TPO membranes both the ethylene propylene diene rubber weather resistance, aging resistance and polypropylene weld ability. In addition, it also has the chemical corrosion resistance, high and low temperature resistance, good dimensional stability and the advantages of using a lap welding, high strength sealing and waterproof layer is formed.