This paper describes a simulation of on-center handling test, in which a linear 3 degrees of freedom vehicle handling model and a power integral steering system model are incorporated to calculate the time histories of steering wheel angle, steering wheel torque, and vehicle lateral acceleration. The cross plots of steering wheel angle-lateral acceleration, steering wheel torque-lateral acceleration, steering wheel torque-steering wheel angle, steering worklateral acceleration, and steering work gradient-lateral acceleration are drawn and all the oncenter handling parameters are determined from them. The simulation results are compared with the data presented in the literatures, which indicates that the simulation results are reasonable.