The heat generating mechanism inside the cavity of the rolling bearing was analyzed and the convective heat transfer coefficient of the bearing raceway surface in different rotation speed was calculated under oil air lubrication and spray lubrication.The fluid domain geometry model of the deep groove ball bearing SKF6208 was established by using the flow field module in Workbench.The temperature field in the cavity of rolling bearing under oil air lubrication and spray lubrication was simulated in different rotation speed.The simulation results show that,at lower bearing rotational speed,the highest temperature in the bearing cavity under oil air lubrication is almost the same as that under spray lubrication,but the whole temperature in the bearing cavity under oil air lubrication is lower than that under spray lubrication.At higher bearing rotational speed,the highest temperature in the bearing cavity under oil air lubrication is far lower than that under spray lubrication.Those conclusions verify the advantages of oil air lubrication in high rotation speed.