Using the cubic B-Spline function as interpolation functions of stress and displacement，this paper has solved the bending problem of isotropic and anisotropic plate with modified complement energy principle and newly created kantorovich method.The method has advantages of high precision，rapid convergence and the convenience to deal with various boundary conditions. It has obtained stress solution with the same precision of displacement and does not exhibit locking effect and kinematic deformation mode，and is proved to be an effective method in solving bending problems of plate.