Abstract: A 3D finite element model for dynamic contact problem of deep-groove ball bearing was established. Considering the deformation of bearing components and actual loaded forms, the explicit dynamics solver LSDYNA was adopted to calculate dynamics response of bearing which operate from acceleration to constant speed and was subjected to three kinds of radial load. The result shows that the bearing experienced strong vibration in acceleration phase which extends to the beginning of constant speed. The equivalent stress was much higher than the yield strength of bearing steel regardless of radial load. With the increase of running time of constant speed of the bearing, the vibration was weaken obviously and the bearing entered a stable working status. The fluctuant range of the radial displacement of the shaft is smaller and the distance between bearing axis and the shaft center is farther when the radial load is higher. The shear stress parallel to rolling direction appeared asymmetrically in rolling element due to the simultaneous existence of pressure and friction force.