The suspension system of most cars and trucks is equipped with front left shock absorber to accelerate the attenuation of frame and body vibration so as to improve the ride comfort of the car. The shock absorber used in the automobile suspension system is the hydraulic shock absorber its working principle is when the frame (or body) and the axle vibration and relative movement the piston in the single acting shock absorber moves up and down the oil in the shock absorber cavity will repeatedly from a cavity through different pores into another cavity. Suspension system vibration due to the impact of elastic components in order to improve the ride comfort of the car suspension and elastic components installed in parallel shock absorber to attenuate vibration. Shock absorbers 1623464 and elastic components bear the task of slow impact and shock absorption too much damping force will make the suspension elastic deterioration and even damage the shock absorber connector. Therefore it is necessary to adjust the contradiction between elastic components and shock absorbers.