Abstract: Automobile chassis structure includes a number of systems, typical transmission system, steering system, braking system, suspension system and many other parts, among which, suspension system is the most important part of automobile chassis.It significantly affects the vehicle’s handling stability and comfortable driving performance.The suspension system is essentially a force conduction device, which connects the body and the wheels, just like the bones of the human body, and transmits the instructions issued by the brain to the hands and feet through the bones to determine the overall dynamic performance of the vehicle.In this paper, the influence of the change of suspension parameters on KC characteristics and chassis dynamics performance is analyzed, and some corresponding optimization design direction and performance improvement measures are given, which has certain guiding significance for guiding automobile design.