Taking the radial hydrostatic gas bearings with axial microchannel grooves as the research object,the load capacity and stiffness of the bearings were simulated and analyzed by Fluent software.According to the three different section shapes of the microchannel grooves,including rectangularequalizing groove,triangularequalizing groove and ovalequalizing groove,the influence of different gas film clearance on load capacity and stiffness of the bearings was analyzed,and the optimum section shape setting of the microchannel groove was obtained.Aimed at the gas bearings with the rectangularequalizing groove,the influence of different width and depth of grooves on load capacity was analyzed.It is found that the load capacity and stiffness of the radial hydrostatic gas bearing can be improved by opening axial microchannel grooves,and the improving effect on load capacity is more obvious when the eccentricity is larger.When the gas film clearance is small,the rectangularequalizing groove has the maximum load capacity and stiffness,and the smaller the gas film clearance is,the greater the influence of the microchannel groove’s shape on load capacity and stiffness.When the gas film clearance is large,three types of grooves have the similar load capacity and stiffness.With the increasing of groove width and groove depth,the load capacity of the bearings are firstly increased and then tends to be stable.