Abstract: The Finite Elements Method is implored to simulate slope excavation and the deformation of the excavated slope is computed.The factor of safety of the slope is solved by using shear strength reduction technique and the critical slip surface can be easily obtained through the max shear strain of the slope at failure.The FEM results are able to evaluate the slope stability and the dangerous zone of the excavated slope can be obtained,which is valuable for slope excavation.The method is adopted to analyze the deformation and stability of an excavated dam abutment rock slope.