As one of calculation in stability analysis of low embankments on clay was the evalution of resisting moment proposed, assuming that the sliding soil mass was a rotating body by such a reason why the range of sliding area was limited, and moreover, the shape of the cross-section of the sliding mass might be a circular arc. As the ground is composed of clay, the φ=0 analysis could be applied though the undrained strength of clay was assumed to be in proportion with the depth. This evaluation was applied to several cases where the sliding most occures. Finally the formula was demonstrated to the possibility of calculating of the resisting moment of footing against sliding.