The rear bumper assembly comprises a rear bumper skin, a rear bumper lamp, a rear bumper guard plate, a rear bumper bright strip, a rear bumper bar iron, a rear bumper lower side wall, a rear bumper frame, a rear bumper corner, a rear bumper buckle, a rear bumper reflector, a rear bumper corner, a rear bumper deflector, a rear bumper lamp, a rear bumper assembly, a rear bumper trailer hook cover plate, a rear bumper bracket and an anti-theft control box. Automobile bumper can play a protective role, which is a safety device to absorb and reduce external impact and protect the front and rear parts of the car body. Twenty years ago, the front and rear bumpers of cars were mainly made of metal. They are stamped into U-shaped channel steel with a thickness of more than 3 mm, and the surface is chrome plated. They are riveted or welded together with the frame longitudinal beam, and there is a big gap between them and the car body, which seems to be an accessory part. With the development of automobile industry, automobile bumper, as an important safety device, is constantly innovating. Nowadays, in addition to maintaining the original protection function, the front and rear bumpers of automobiles also pursue harmony and unity with body modeling and their own lightweight. In order to achieve this goal, at present, the front and rear bumpers of automobiles are made of plastic, which is the so-called plastic bumper. Plastic bumper is composed of three parts: outer plate, cushioning material and cross beam. Among them, the outer plate and buffer material are plastic, and the cross beam is punched into a U-shaped groove with a thickness of about1.5 mm; The outer plate and cushioning material are attached to the cross beam, which is connected with the longitudinal beam of the frame by screws and can be disassembled at any time. This kind of plastic bumper is usually made of polyester and polypropylene by injection molding. There is also a kind of plastic abroad called polycarbonate, which is made by infiltration of alloy components and injection molding of alloy. Bumper not only has high strength and stiffness, but also has the advantages of welding and good coating performance, so it is more and more used in automobiles. Plastic bumper has strength, rigidity and decoration. From the safety point of view, in the event of a collision accident, it can play a buffering role and protect the front and rear car bodies. From the appearance, it can be naturally combined with the car body, which is very decorative and becomes an important part of decorating the appearance of the car.