In order to improve the working stability of aerostatic bearing,an annular multihole restrictor aerostatic bearing was designed,its physical model was established,and the large eddy simulation method was used to analyze the air film flow field near the outlet of the orifice.The results show that the gas film pressure of the aerostatic bearing is separated in the gas film clearance near the outlet of the orifice,however the gas film pressure curve is coincident far from the outlet of the orifice.The maximum pressure drop of the bearing with 9 orifices is about 26% of that with 1 orifice,and the maximum speed increase is about 43% of that with 1 orifice,which shows that increasing the number of orifices can significantly reduce the sudden drop of pressure and speed near the outlet of small orifice,and improve the working stability of bearing.During the aerostatic bearing working,the sudden change of pressure and speed near the outlet of the orifice can cause microvibration,and the use of annular multihole restrictor can significantly reduce the microvibration.