In order to improve calculation accuracy and efficiency,CFD software Fluent was used to analyze the bearing capacity of radial dynamic pressure gas bearing.The three-dimensional physical model of dynamic pressure gas bearing was established by Solidworks software.Starting from the compressible fluid lubrication equation and the continuity equation,the basic form of the dynamic pressure lubrication Reynolds equation under isothermal conditions was obtained,and the radial dynamic pressure bearing was calculated by the finite difference method.Fluent was used for finite element simulation to directly solve the basic equation of gas lubrication,Navier-Stokes equation,and the influence of bearing parameters such as eccentricity and aspect ratio on the bearing capacity of gas bearings was analyzed.The results show that the pressure distribution of the whole gas film of the bearing is geometrically symmetrical along the axial center line of the bearing.Due to the eccentric action of the bearing,the gas film thickness is the smallest in the area of the lowest end of the bearing.There is a maximum positive pressure area in the gas inflow direction and a maximum negative pressure area in the gas outflow direction.The pressure difference of gas makes the bearing have a certain bearing capacity.With the increase of eccentricity and aspect ratio,the bearing capacity of the bearing shows a nonlinear upward trend with the change of speed.