A model of the spherical plain bearings under static load stress field is developer based on APDL of ANSYS software. In the finite element model, the spindle and house components of the bearing are instead of a rigid surface. The stress distributions of bearing under different load are carried out, then the ultimate loading capacity of the bearing is determined. Finally, the relationships of the maximum contact pressure with the bearing load are obtained using the linear least squares method. These formulas provide a theoretical reference for the structural strength selection of the spherical plain bearing.