Oil injection lubrication system is widely used in high-speed rolling bearings.The temperature rise characteristic of bearings under oil injection lubrication is an important factor affecting the dynamic stability of bearings.Based on the two-phase flow theory,the 71904C angular contact ball bearing was taken as the research object,and the bearing model was set up.The motion of each component was described by rotating coordinate system, and the influence law of two-phase flow and heat transfer efficiency of rolling bearings under different parameters of oil injection lubrication was analyzed.The results show that as the speed of the bearing increases,the stirring torque of the bearing also increases accordingly,leading to an increase in the internal temperature of the bearing.The increase in viscosity of lubricating oil leads to an increase in the stirring torque of the internal flow field of the bearing,resulting in an increase in bearing temperature.As the oil injection speed of the bearing increases,the temperature of the internal flow field shows a trend of first increasing and then decreasing,so there is an optimal oil injection speed that minimizes the temperature rise of the bearing.