In engineering practice,the failure of high-speed rolling bearings due to heat generation seriously affects the normal operation of the equipment.Therefore,it is important to study the temperature field of the bearing.By taking the B7010C/P4Y bearing commonly used on the spindle of highspeed machine tools as the research object,the heat generation of bearing was analyzed,the steady-state temperature calculation model of bearing was established by using the thermal network method,and the bearing temperature was solved under the conditions of different speed,load and lubricating oil temperature.The results show that the temperature of each node is increased with the increase of the rotational speed.The highest temperature is on the steel ball node,and the temperature of the inner raceway node,the inner ring node,the outer raceway node and the outer ring node is decreased in turn.The steadystate temperature of each node is decreased linearly with the decrease of lubricating oil temperature,which indicates that cooling lubricating oil plays an important role in controlling bearing temperature.The outer ring temperature of the bearing was tested by the aeroengine main shaft bearing test machine,and the feasibility of solving the bearing temperature by the thermal network method was verified.