The main force-bearing parts of a car when it collides are the bumper and the longitudinal beam of the body. In order to buffer the impact force during the collision, most of the front of the body is designed with a collision buffer zone, and the stiffness distribution of the body is also uneven. In some accidents, such as when a car crashes into a rear-end collision with a truck without rear guards, or a rollover accident occurs after the car collides with the guardrail, or a body side collision occurs, such accidents often do not have a direct impact on the front of the body. , Mainly the upper part of the body and the side collide, the stiffness of the collision body part is very small, although the cabin is greatly deformed, causing the occupants in the car to be injured or killed, but due to the wrong part of the collision, sometimes the airbag cannot be opened. Especially in a side collision, if the side airbags are not equipped, the primary and secondary airbags cannot be detonated because they cannot meet the detonation conditions, which can easily cause fatal injuries to the occupants.