Abstract: A topology optimization method for designing the excavation slope is put forward, and topology optimization method based on the stiffness in the optimization module of Abaqus has been used to optimally design an excavation slope. The change in the material density and the strain energy changing with the optimization of volume is analyzed in the process of topology optimization. The strain energy and horizontal displacement of the slope before and after topology optimization design are compared and analyzed. And the stability of the conventional method and the topology optimization method for designing the excavation slope is analyzed by the strength reduction method. The topology optimization method for designing the excavation slope reduces element along with the original slope and the optimization area of the slope has no phenomenon of cavitation. The slope after topology optimization tends to be triangle and lateral displacement distribution becomes uniform, so the topology optimization method for designing the excavation slope is feasible. The slope ratio is changing, and the upper slope ratio is smaller. The safety factor of the optimizing area and the slope designed by the topology optimization is equal to the safety factor for the slope designed by the conventional method in the excavation under the same volume. The sliding arc of the excavation slope designed by the topology optimization is less obvious than that of the slope designed by the conventional method. The topology optimization method for designing the excavation slope can well consider the material properties of the slope soil and the strain energy of the slope in the design.