The statement is about establishing a finite element dynamic analysis model for a rolling bearing with a pit defect on its outer ring surface. Considering the influence factors such as load, speed, contact and friction, the dynamic response of the bearing outer ring surface with pit defects is studied. The shear stress when the ball enters and leave the defect and the vibration acceleration change between the rolling element and the outer ring are analyzed. Based on the shear stress distribution and vibration response information inside the structure, the fault mechanism of high-speed bearings can be further studied, which furnish a theoretical foundation for improving maintenance and management level for such equipment.