With the development of ultra-precision machining technology and ground micro-low gravity simulation,the performance requirements for aerostatic bearings are getting higher and higher.Because the structural characteristics of the traditional orifice restrictors cannot fully meet the needs of the actual use,the micro-hole throttling aerostatic bearing restrictors with the same order of magnitude as the air membrane gap has attracted attention more and more,due to its good stiffness and bearing characteristics.However,in the development of micro-hole throttle aerostatic bearing,the processing technology of micro-hole limits its popularization and application.Theoretical simulation research on three prevalent micro-hole machining processes was conducted.By constructing simulation models for each process and employing bidirectional fluid-solid coupling simulation methods,the dynamic and static characteristics of micro-hole restrictor aerostatic bearings produced by these processes were compared and analyzed.The results indicate that tapered hole bearings exhibit superior load-carrying capacity compared to the other two types,albeit with higher air consumption and reduced stiffness at low clearances;thin-walled straight-hole bearings demonstrate marginally lower load-carrying capacity,yet they maintain better stiffness at higher clearances;mosaic bearings,while exhibiting less optimal performance in load-carrying,provide greater stiffness and lower air consumption when the clearance is minimal.