In order to obtain the complete three-dimensional flow field of circular aerostatic bearing with high supply air pressure,the three-dimensional modeling and simulation of circular aerostatic bearing with high supply air pressure were carried out based on simulation software of Workbench,and the parameter distribution of flow field of the whole flow channel and the crack jet zone of the disk was obtained.The symmetry plane of gas film of the three-dimensional model was intersected with the axial symmetry plane of the bearing disc and the steady flow tube,and the symmetry line of gas film was cut.The parameter distribution of flow field on the symmetry line of the gas film was analyzed and compared with the calculation results of flow field of the two-dimensional simplified model.The effectiveness of the two modeling and analysis methods was verified.The results show that the variation laws of Mach number and static pressure distribution in the gas film obtained by the two modeling and analysis methods are consistent,that is,the high pressure can be maintained in most of the area of gas film,and the pressure drops rapidly only in a very narrow range at the film outlet.At the same time,a supersonic crack jet of disk can be formed near the outlet of gas film,so that the high pressure in the upstream gas film is not affected by the low pressure in the downstream environment.Different turbulence intensities have no obvious effect on the static pressure of the flow field in the circular aerostatic bearing with high supply air pressure,but have a small impact on the Mach number in the crack jet zone of the disk and the far field region of the air flow.