The front and rear bumper stop of automobiles not only have decorative functions, but more importantly, they are safety devices that absorb and alleviate external impacts, protect the body and protect the body and occupants. The bumper stop has the functions of safety protection, decoration of the vehicle and improvement of the aerodynamic characteristics of the vehicle. From a safety point of view, a car can play a buffering role in a low-speed collision accident, protecting the front and rear car bodies; it can play a certain role in protecting pedestrians when an accident occurs with a pedestrian. From the appearance point of view, it is decorative and has become an important part of decorating the appearance of a car; at the same time, the car bumper stop also has a certain aerodynamic effect.

The installation of door bumper stop means that several high-strength steel beams are placed horizontally or obliquely in the door panels of each door, which play the role of front and rear bumper stop, so that the entire car has bumper stop on the front, rear, left, and right to protect the car. Forming a "copper wall and iron wall", so that the car occupants have a maximum safety area. Of course, installing this kind of door bumper stop will undoubtedly increase some costs for car manufacturers, but for car occupants, safety and sense of security will increase a lot.

Many years ago, the front and rear bumper stop of automobiles were mainly made of metal materials. The U-shaped channel steel was punched out of steel plates with a thickness of more than 3 mm, and the surface treatment was chrome-plated. It was riveted or welded with the frame rails, and compared with the body. The large gap seems to be an additional part that looks very unsightly. With the development of the automobile industry and the large-scale application of engineering plastics in the automobile industry, automobile bumper stop, as an important safety device, have also moved on the road of innovation. At present, the front and rear bumper stop of automobiles must not only maintain the original protection function, but also pursue harmony and unity with the body shape, and pursue their own lightweight. The front and rear bumper stop of a car are made of plastic, and they are called plastic bumper stop.