In order to investigate the effect of surface texture on the lubrication performance of angular contact ball bearings under oil air lubrication,surface texture was designed on the inner race of angular contact ball bearing.Based on the gas-liquid two-phase flow theory,the Multiple Reference Frame(MRF) model and the volume of fluid(VOF) method were used to numerically analyze the lubricant flow characteristics inside the cavity of angular contact ball bearing.The effects of four kinds of surface textures,long groove and short groove textures,rectangular and cylindrical textures,on the lubrication performance of diagonal contact ball bearings were compared and analyzed,and it was found that long groove surface texture had the most significant effect on the lubrication performance.The parameter effect of long groove surface texture on the lubrication performance was further investigated.The results show that the volume fraction of oil phase inside bearing cavity is increased and then decreased with the increase of groove depth and area rate,and is gradually increased with the increase of groove width.There is an optimal texture parameters which makes the volume fraction of the oil phase inside bearing cavity maximum.Therefore,the reasonable design of texture parameters can effectively improve the lubrication performance of angular contact ball bearings,and this results have certain reference value for surface texture design of angular contact ball bearings.