The threedimensional flow field model of conical gas bearing gas film was established by CATIA software,and the structured grid was established.The fluid dynamics simulation was carried out by Fluent software，and the pressure and gas flow distribution of the threedimensional flow field were obtained.The loadcarrying capacity was calculated,and the effects of supply pressure,film thickness,air supply hole position and air supply hole diameter on bearing performance were analyzed.The results show that the pressure and gas flow rate near the air supply hole are the largest,the larger the supply pressure and the diameter of the air supply hole,the higher the loadcarrying capacity and gas flow rate of the bearing.The reduction of the film thickness can effectively improve the bearing capacity of the bearing and save gas consumption at the same time.Varying of air supply hole position within a certain range has little effect on the bearing capacity of the bearing,but when the air supply hole is close to the upper edge,the bearing capacity of the bearing will be significantly reduced,and the external displacement of the air supply hole will also cause an increase in gas consumption.