In modern industry,thinner,lighter,curved and complex surface workpieces are playing a more and more important role in the mechanical structure.Therefore,the quality and machining precision requirements of the workpieces are also getting higher and higher.In order to get higher machining accuracy and stability,the weakened nonlinear factors become the main factors to improve the cutting stability in the machining system.In this paper,the five-DOF dynamic model of the angle contact ball bearing was established,and the whole high-speed dynamic model with the combination of spindle-holder-tool joints.The rationality of the model was verified by comparison with the FRF of traditional rigid model and experiments.Finally,the nonlinear characteristic influences of high speed on angular contact ball bearings were analyzed,which were introduced into the whole spindle system in the form of bearing parameters.The nonlinear response and stability influences of bearing parameters on high-speed spindle system at bearing and tool point were studied.The results provided a theoretical basis and an evaluating criterion for nonlinear stability prediction and product surface quality improvement.