The installation of door rear bumper guard is to place several high-strength steel beams horizontally or obliquely in the door panel of each door, which plays the role of front and rear rear bumper guard, so that the whole car is "escorted" by rear bumper guards at the front, rear, left and right, forming a "copper wall and iron wall", so that the car passengers have a maximum safety area. Of course, installing this kind of door rear bumper guard will undoubtedly increase some costs for automobile manufacturers, but for car passengers, the safety and sense of security will increase a lot.