Abstract：Based on the field investigation，geology analysis and numerical simulation of a large-scale slope in reservoir area on the upstream of Yellow River，the rules of deformation and failure of this kind of slopes are disclosed. The layered rock bends like cantilever under the effect of gravity. When rock mass in back of the slope bends to a certain extent，its root will break off and create a continuous weak surface，and shear creep will occur in the toe of the slope. When the shear stress excesses to the shear strength of the weak surface，the topple-slumping will occur in the shear stress concentration zone of the slope.
