Automobile suspension consists of three parts, such as elastic element, shock absorber and force transmission device. The three parts are buffered, vibration damping and force transfer. The elastic element transfers the vertical force and reduces the impact and vibration caused by the roughness of the pavement. The damper is a hydraulic shock absorber, which is to accelerate the vibration of the body. It is the most precise and complex mechanical part in the suspension mechanism. Force transfer device refers to the upper and lower arm, fork frame frame, steering knuckle and other components, used to transfer the longitudinal force, lateral force and torque, and ensure that the wheels relative to the frame (or body) have relative motion determined.