As a kind of large heavy-duty machinery,the working environment of the main bearing of shield machine is harsh,bearing damage will cause great economic losses,in order to ensure high reliability,lubrication performance is extremely critical.The fluid-structure interaction model of bearings was modeled and simulated by Fluent,and the influences of bearing speed,load,lubricating oil viscosity,lubricating oil flow and lubrication mode on bearing temperature rise were studied.The results show that the temperature is higher in areas with less lubricating oil;the speed of the main bearing of the shield machine is the most critical factor affecting the temperature rise,and the temperature rise increases sharply with the increase of the speed;the bearing temperature rise increases with the increase of load;the temperature of lubricating oil is the lowest near the kinematic viscosity level of 320;the influence of flow on bearing temperature rise is different at different speeds,and when the speed is low,temperature rise first decreases and then increases with the increase of flow,and when the speed is high,the situation is opposite.A lubrication method similar to the oil-air principle is applied to the lubrication of the main bearings of the shield machine,the lubrication state is improved through the simulation.