In the automobile suspension system is widely used in the cylinder electronically controlled shock absorber, and in the compression and stretch stroke can play a damping role called two-way effect shock absorber, and the use of new shock absorber, it includes inflatable shock absorber and resistance adjustable shock absorber. In the compression stroke (the bridge and the frame are close to each other), the damping force of the shock absorber is small, so as to give full play to the elastic role of the elastic element and mitigate the impact. At this point, the elastic element plays a major role. In the compression stroke (the bridge and the frame are close to each other), the damping force of the shock absorber is small, so as to give full play to the elastic role of the elastic element and mitigate the impact. At this point, the elastic element plays a major role. When the relative speed between the axle (or wheel) and the axle is too large, the shock absorber is required to increase the liquid flow automatically, so that the damping force is always kept within a certain limit, in order to avoid bearing too much impact load,