With the rapid development of rotating equipment and the continuous increase of spindle speed,the operating conditions become more complex and higher demands are placed on the performance of rolling bearings.The lubrication conditions inside the bearing cavity become more important,and the under-race lubrication becomes the main lubrication method for high-speed rolling bearings in recent years.By focusing on the lubrication characteristics of rolling bearings under the under-race lubrication method,the structural mechanism and numerical analysis theoretical basis of the under-race lubrication were introduced.The influences of the structural parameters of the oil receiving scoop and bearing,and the operating conditions on the oil capture efficiency,two-phase flow characteristics,and thermal characteristics of rolling bearings under the under-race lubrication system were summarized.It was pointed out that the current research has not sufficiently explored the internal two-phase thermal flow characteristics of rolling bearings under the under-race lubrication method with changes in bearing structural parameters and the accuracy of heat generation calculation of bearings under high-speed rotation.The future possible development directions for the research on under-race lubrication were proposed,including the influence of cage structural parameters on the two-phase thermal flow characteristics,the improvement of oil capture efficiency and frictional heat generation model under high-speed rotation,and the optimization design through multifactorial analysis.