The convective heat transfer of high-speed airflow in the flow channel of high-pressure circular aerostatic bearing (HPCAB) is closely coupled with the heat conduction in the discs of bearing,which constitute a typical conjugate heat transfer(CHT) problem.In order to improve computational efficiency,a 2D axisymmetric model was adopted in this study.Using ANSYS ICEM software,structural grid division was performed on the fluid and solid domains.Using the ANSYS Fluent numerical simulation software,the distribution of Mach number and static temperature on the symmetry line of gas film,heat flux distribution at the fluid-solid interface of HPCAB based on axial symmetry condition,and temperature field of bearing discs were calculated.The comparison of the calculation results of 2D model with existed results of the 3D model shows that the both are basically consistent with each other.The reliability of the calculation results can be well verified with each other,and a simplified approach is provided for further analyzing other more complex thermo-fluid-structural coupling problems of HPCAB.