Automobile suspension is composed of elastic elements, guide mechanism and shock absorber. Some suspensions also have buffer blocks and lateral stabilizer bars. Wherein the elastic element includes a leaf spring, an air spring, a coil spring and a torsion bar spring. Modern car suspensions mostly use coil springs and torsion bar springs, and high-end luxury buses use air springs. Automobile suspension generally refers to independent suspension, which is an important part to ensure riding comfort. Meanwhile, as a power transmission part connecting the frame or body with the axle and wheel, automobile suspension is also one of the important parts to ensure the safe driving of the automobile.