Based on the theory of gas-liquid two phase flow,a numerical calculation model of angular contact ball bearing was established by using the multi-reference frame method.The oil volume fraction,the oil-air flow characteristics on the cage surface,inner ring and outer ring were compared and analyzed under different nozzle positions and rotating speeds.The results show that at low bearing speed,the oil volume fraction inside the bearing cavity when the nozzle is at the front end is higher than that when the nozzle is at the rear end,and the variation with the circumferential angle is more obvious.When the nozzle is at the front end,the accumulation of lubricating oil will occur on the lower side of the cage,resulting the lubrication oil cannot be discharged from the outlet in time.When the nozzle is at the rear end,the distribution of lubrication oil on the cage surface is uniform.The oil volume fraction on the left side of the inner ring is higher when the nozzle is at the front end,and the distribution of oil on the outer ring changes greatly.The oil volume fraction on the right and middle side of the inner ring,as well as on the middle side of the outer ring,is higher when the nozzle is at the rear end.Under the different rotating speed,the effect of nozzle position on the distribution of lubrication oil is different.At low rotating speed,the oil volume fraction is higher when the nozzle is at the front end.At high rotating speed,the nozzle position has little effect on the distribution of lubrication oil inside the bearing cavity,the lubrication oil is uniformly distributed inside the bearing cavity,and its accumulation on the lower side of the cage is not obvious.