In order to improve the static performance of aerostatic thrust bearing,a new annular multi-hole aerostatic thrust bearing was designed.Based on the principle of gas lubrication,the three-dimensional physical model of annular multi-hole aerostatic thrust bearing was numerically simulated by using the finite volume method.The effects of the number of orifices,the diameter,the distribution mode and the air supply pressure of the restrictor on the static performance of the aerostatic thrust bearing were studied.The results show that the number of orifices has a significant effect on the bearing capacity of annular aerostatic thrust bearing,but the increase of bearing capacity slows down when the number of orifices increases to a certain extent.The orifice diameter has a great influence on the bearing stiffness,and the optimum stiffness increases with the decreasing of the orifice diameter.The static performance of aerostatic thrust bearing is obviously affected by the arrangement of orifices and the air supply pressure.