To further optimize the static performance of static pressure gas radial bearings,a composite throttling type static pressure gas radial bearing with axial and circumferential pressure equalizing grooves was proposed based on the traditional small hole throttling.Fluent was used to compare and analyze the static characteristics of the bearings with traditional orifice throttling and different forms of composite throttling,and the influence of the cross-sectional shape of the equalizing groove and the gas supply pressure on the static characteristics of bearings was explored.The orthogonal experiments were used to explore the influence of the structural parameters of the restrictor on the bearing characteristics.The results show that the composite throttling static pressure gas bearing improves the static characteristics of the bearing to a certain extent,and the best effect is achieved when the pressure equalizing groove is arranged in a “mouth” shape and the cross-sectional shape is rectangular.An increase in gas supply pressure can also improve the static characteristics of bearings.The influence of the diameter of the orifice and the depth of the equalizing groove on the static characteristics of bearings is larger than that of the depth of the orifice and width of the equalizing groove.The increase in the diameter of the orifice and the depth of the equalizing groove results in a trend of first increasing and then decreasing in the bearing capacity and stiffness of bearings.