In order to improve the machining accuracy of elliptical arc channel of starlike inner race in constant velocity universal joint,on the basis of analyzing the structure of universal joint channel,we proposed a scheme of grinding starlike inner race chan-nel with ellipsoidal grinding wheel.For this scheme,the size of the wheel is designed and calculated,and the basic size of the el-lipsoidal wheel is preliminarily obtained.According to the actual grinding state of the wheel,the structure of the wheel is opti-mized.In order to verify the correctness of the optimized wheel shape,UG and VERICUT software are used to simulate the grind-ing process of channel with the ball cage channel grinding machine and the grinding process of channel with the new ellipsoidal grinding wheel respectively,and the simulation results show that the error of the latter is reduced,which proves the feasibility of the scheme in theory.