Air seat shock absorbers are indispensable in the suspension system of trucks. They are used to suppress the spring. They are used to suppress the shock when the spring bounces after shock absorption and the impact from the road. The characteristics of the shock absorber are adjustable spring height bearing capacity and spring stiffness; The natural vibration frequency is low; Good isolation from high frequency vibration and noise; Utilizing the damping effect of air; Long service life. Commonly used Renault Megane front shock absorber air spring is divided into four types: membrane type hybrid type sleeve type and capsule type. The main components include top cover pressure plate piston stop and buckle. The top cover pressure plate piston and capsule can form a closed system. The sealed air spring is filled with compressed gas (pressure is 0.2~ 0.7mpa) and the spring function is realized by using the compressibility of gas. The air bag can control the pressure in the air sac by using the height regulating valve to make the stiffness of the air spring adjustable when the load on the spring increases the pressure increases the stiffness of the spring increases on the contrary when the load decreases the pressure in the spring decreases the stiffness decreases.