The lubrication efficiency of gear oil injection lubrication system is related to oil injection parameters,gear ratio,nozzle layout and other parameters,but the current nozzle layout angle mostly adopts empirical design,which is lack of accuracy and has high time cost.Aimed at the oil injection lubrication of high linear speed gear,the fluid calculation model of oil injection lubrication of high-speed spur gear was established based on CFD method,and the interference between the airflow generated by the rotation of the gears was analyzed.The optimal nozzle angle was determined by the streamline diagram of the flow field,that is the deflection angle of the flow around the meshing zone and the first contact point of the tooth surface to the pinion.The influence of the gear ratio and rotating speed on the nozzle angle arrangement was studied.The results show that the airflow interference caused by the rotation of the gear creates the airflow into the mesh zone,and the lubrication efficiency of the nozzle angle arranged along this airflow direction is increased by 24.4% compared with the traditional arrangement.The airflow around the gear and the optimal nozzle angle are only related to the gear geometry,but not related to the working condition parameter setting.