Slope stability analysis is the theoretical basis for slope safety assessment and stabilization. The inadequacy of the domino analysis method only considers the sliding shear failure of the bottom surface of the strip,and a domino analysis method considering the form of toppling failure of the slope is proposed. In this study, the calculation method and solution steps of the domino model under the assumption of toppling failure are given, and the discriminant method for toppling failure, sliding shear failure and mixed toppling and sliding shear failure of slope is proposed. The theory of domino analysis method for slope stability and its application in slope engineering are further refined and promoted by investigating the slope stability of domino model under toppling failure mode.