Abstract: Tires are the only part of the car that contacts with the ground. Studying the performance of the tires is important for improving the performance of the car,especially the stability of the car. The characteristics of different tires were predicted by the data sorting and fitting of the mechanical properties of the tires and the comparison of the data of the two typical tires. The pacejak2002 tire file of the tire was generated by the simulation software OptimumT,and the steering wheel angle step input and single shift line simula-tion were performed in the ADAMS to compare the response of the racing car with different tires. The results show that the lateral stiff-ness of different types of tires has a large difference;the lateral stiffness of the tire has a great influence on the transient response per-formance of the car,and the response time is inversely proportional to the cornering stiffness of the front wheel. The angular velocity gain is proportional to the front wheel side deflection stiffness.