Angular contact ball bearing is an important kind of component in the feed system of CNC machine,and its speed change during acceleration has great influence on its dynamic characteristics. Taking angular contact ball bearing 7603025 as investigation object,a dynamics analysis model of multi-rigid-body for angular contact ball bearing was established. Based on ADAMS method,the dynamic simulations of angular contact ball bearing in the acceleration process for different radial load,axial load and angular acceleration conditions were performed. The influence of radial load,axial load and angular acceleration on its dynamic characteristics including cage speed,centroid trajectory of cage and the contact force between rolling ball and cage in the acceleration process were studied,and the experimental verification was carried out. The study results show that the increase of radial load and angular acceleration will increase the impact force of rolling ball on cage,which cause the fluctuation of cage speed increase and the movement of cage centroid more unstable,and the increase of axial load will decrease the impact force of rolling ball on cage,which make the fluctuation of cage speed reduce and the movement of cage centroid more smooth. The simulation results were in good agreement with the experimental results,and the validity of the dynamic analysis model was verified.