In order to investigate the friction and wear performance of bearing steels under high temperature lubrication conditions,the microstructure,phase and hardness of GCr15 high-carbon bearing steel and G20CrNi2Mo carburizing bearing steel were analyzed by the scanning electron microscope (SEM),X-ray diffraction (XRD) and hardness tester,etc.The friction and wear properties of high temperature lubrication of the bearing steels under different conditions were studied by QG-700 friction and wear tester,and the wear mechanism was analyzed.The results show that the microstructures of the two bearing steels are mainly Martensite,carbide and retained Austenite.The surface hardness of G20CrNi2Mo carburizing bearing steel is higher than that of GCr15 high-carbon steel.The wear rate of two kinds of bearing steels increases with the increase of load and friction speed under high temperature lubrication.The average friction coefficient of GCr15 bearing steel decreases with the increase of load and friction speed,while the average friction coefficient of G20CrNi2Mo bearing steel decreases with the increase of load,but changes little with the increase of friction speed.The wear resistance of G20CrNi2Mo carburized bearing steel is generally better than that of GCr15 high carbon bearing steel,it is because that the carburized bearing steel has high hardness and has the carburized layer with tempering stability.The wear mechanisms of two kinds of bearing steels under high temperature lubrication conditions are abrasive wear and oxidation wear.