It is found that the angle of guide cone of orifice throttles is one of the important factors affecting the static and dynamic performance of aerostatic bearing,and the size of guide cone angle is easy to control in machining.To reveal the influence law of the size of guide angle on bearing dynamic and static performance,the theoretical model of the orifice throttling areostatic thrust bearing was established,and the pressure distribution around throttle’s outlet and the vortex core distribution in the air cavity at different orienting cone angle throttles were studied by the finite element simulation based on FLUENT software.By utilizing the DOE simulation experiment,the static characteristic curve of bearing at different guiding cone angle was obtained.The results show that small angle of the guide cone can slow down the pressure drop around the outlet of throttle hole, reduce the number of vortex cores in the air cavity.With the increasing of guide cone angle,the load capacity and mass flow are decreased,while stiffness curves tend to be consistent after a small increase.Therefore,the use of small guide Angle throttle can effectively improve the stability and load capacity of the bearing.