On the basis of the structural and loading characteristics of yaw bearing in wind generator,a global finite element model of bearing was established,and the contact force distribution under combined external loads was solved.In order to reduce the complexity of the model and the computational scale,the contact force and deformation relationship between ball and raceway were obtained by Hertz contact theory.The non-linear spring elements were used to simulate the contact behavior between ball and raceway,and the effectiveness of this model was proved by empirical formula and experiment.A local equivalent contact model of bearing was developed.The stress distribution and fatigue life of bearing under different contact angles and raceway radius coefficients were systematically analyzed.The results show that the maximum stress of raceway surface decreases with the increase of contact angle,while the fatigue life of bearing increases with the increase of contact angle.The raceway radius coefficient has the most significant effect on the stress distribution,with the increase of raceway radius coefficient,the maximum stress value of raceway surface increases and the fatigue life decreases.Under different contact angles and raceway radius coefficients,the stress distribution of raceway along the surface depth is basically the same.