Based on the analysis of the bearing loads and kinematics,the sliding phenomenon between ball and raceway is studied.The velocity distribution of the sliding on contact region under certain conditions was calculated and the zero sliding points were indicated.Ballplate wear tests were conducted to obtain the friction coefficient and wear coefficient of bearing steel under boundary lubricant conditions.A finite element wear model of ball and inner ring is established to analyze the effect of running time,radial load and contact angle coefficient on ball bearing wear by using Finite Element Method (FEM) and Archard wear calculation model.