A calculation model of orifice restrict radial aerostatic bearing was established.The ANSYS CFX software was used to calculate the load capacity of radial aerostatic bearing,and the accuracy of numerical calculation was verified through experiments.The law of the effect of the orifice diameter,pocket diameter and pocket depth on the load capacity of radial aerostatic bearing was analyzed.Results indicate that the method of calculating load capacity of radial aerostatic bearing through CFX numerical simulation is feasible,and the complex gas flow in the orifice structure can be analyzed effectively.The changes of orifice structure have a large effect on load capacity,with the increasing of orifice diameter,the load capacity is firstly increased and then decreased,and the load capacity is firstly increased,and then remains stable by increasing both the pocket diameter and the pocket depth.