To study the static characteristics of the KF11028 spherical plain bearing with ribs,the threedimensional bearing model was established by Solidworks.The static characteristics of the bearing under normal and skew conditions at the radial load of 1 575 kN were analyzed based on ANSYS Workbench using finite element method.The results show that under normal operational condition,the maximum equivalent stress of the inner ring occurs at the oil hole,and the maximum equivalent stress of the outer ring occurs at the edge of the inner spherical surface,which is less than the yield strength.The maximum contact stress appears at the edge of the contact surface.Under the skew condition,the maximum equivalent stress of the inner ring occurs at the oil hole,and the maximum equivalent stress of the outer ring occurs at the edge of the inner spherical surface at the side of the rib,which is higher than the yield strength.The maximum contact stress appears at the edge of the contact surface.The skew of the inner ring results in uneven stress on the spherical plain bearing,which induces extreme stress concentration in some parts.Therefore,the spherical plain bearing should not work for a long time under high load with large skew angle of inner ring.