By using parametric APDL language to program,the threedimensional flow model of the aerostatic bearing was established in ANSYS.The model was put into the FLUENT in the Workbench environment to analyze the effect of micropore number in multiple orifices array restrictor,throttle pore diameter,and pressure cavity diameter and depth on the stability of aerostatic bearing.The results show that the microvibration can be significantly reduced by using multiple orifices array restrictor so as to improve the stability of the aerostatic bearing.The microvibration of the aerostatic bearing is reduced and the stability is improved with the decreasing of the throttle pore diameter and the pressure cavity diameter,as well as the increasing the cavity depth.