Thermoplastic polyester elastomer (TPEE or COPE) is a kind of linear block copolymer containing PBT(polybutylene terephthalate) polyester hard segment (crystalline phase) and aliphatic polyester or polyether (amorphous phase) soft segment. TPEE belong to high performance engineering level elastomer with high mechanical strength, good elasticity, impact resistance, creep resistance, cold-resistant, bending fatigue resistance, oil resistance, resistance to chemicals and solvents erosion etc, and has good processability, and can be filled, enhancement and alloying modification, in auto parts, hydraulic hose, cable wire, electronic appliances, industrial products, stationary, biological materials, and other fields has been widely used.