In order to improve the calculation efficiency of the aerostatic bearing,an impedance model for calculating the loading capacity of the aerostatic bearing with the radial pressure groove arranged on the surface was presented,and the feasibility of the impedance model was verified by CFD numerical simulation,and the influence of the depth,radius and angle of the pressure groove on the impedance model was analyzed.The results show that the impedance model can be used to calculate the loading capacity of radial pressure groove and non-pressure groove with different section shapes,and the results of CFD numerical simulation are in good agreement with those of the impedance model.When the air film is small,the system impedance coefficient and bearing capacity of the air aerostatic bearing can be improved by arranging the pressure groove on the surface of the aerostatic bearing.The depth and radius of the pressure groove have great influence on the impedance coefficient of the system while the angle of the pressure groove has little influence on the impedance coefficient of the system.