The so-called suspension is the structure connecting the wheel and the vehicle body, because it actually makes the vehicle body suspend in the air, so it is named. Its main function is to absorb the impact from various roads to the vehicle body, so as to ensure the comfort of the passengers in the vehicle and the stability of the vehicle body. Shock absorbers, which are well known to consumers, are important structures for suspension. In addition, the suspension system also includes elastic elements (such as torsion bar spring, spiral spring, air spring, etc.) and guiding elements (such as various members), etc.

Generally, the front suspension of automobile adopts independent suspension, which is required by the structure arrangement of engine and gearbox. The rear suspension system has three basic forms, namely, independent suspension, independent suspension and semi independent suspension between them.

Independent suspension is the most suitable suspension system. The advantages of independent suspension compared with non independent suspension have been established by nature. Compared with the non independent suspension model, the model with independent suspension will not feel "body floating" even when driving at high speed.