To further investigate the effect of surface morphology on gas foil bearings,the effect of surface roughness and surface texture on the static characteristics of radial gas foil bearings under misalignment was investigated by numerical analysis.The Reynolds control equation of the gas foil bearing was solved by Successive Over Relaxation (SOR) and finite difference method.The static characteristics of the bearings were analyzed under different parameters,including the texture shape,texture depth,texture number,texture ratio and surface roughness.The results show that the effects of different shapes of textures on the performance of gas foil bearings are different,and the elliptical texture is more effective in improving the static characteristics of the bearings.There exists a set of relatively optimal values of the texture depth,texture number and texture ratio,which can improve the bearing load capacity and reduce the frictional moment at the same time.Compared with the non-textured radial gas foil bearings,the radial gas foil bearing with specific texture can increase the load carrying capacity by 36.32% and reduced the frictional torque by 1.66%.