Tire lateral stiffness and characteristic functions of force and their applications were introduced.The results showed that as the tire lateral stiffness increased，the required slip angle of the vehicle under any given lateral acceleration decreased，resulting in better handling stability performance of the vehicle.When matching the handling stability performance of tires and vehicle，the tire structure，pattern，and formula could be optimized through the characteristic values of tire lateral force coefficient，load sensitivity at the side slip angle of 1°，and tire load transfer sensitivity at the side slip angle of 4°，and a reasonable design scheme could be selected.The larger the vehicle stability coefficient was，the better the understeer steering performance of vehicle was.
