Abstract: Chenjiazui landslide is Hanjiang Gushan hydropower station near the dam landslide, landslide if instability will affect the dam of hydraulic structures located upstream and power generation, is a great technical subject first to solve engineering Gushan hydropower station. Through the engineering geological mapping, drilling, adit, rock and soil testing a large number of survey work, find out the landslide volume of about 2 400 000 of m³, is a large rock cutting landslide, the overall situation in the basic stability of the state, before and after completion of the superposition rainstorm long rain sliding body of water saturated conditions of the landslide, on the whole is unstable to an unstable state, so need to take measures for landslide. By comparison, the proposed combination of dam three stage cofferdam construction to take the slope to reduce load on the landslide (used as cofferdam filling material)+front riprap revetment engineering measures, the landslide stability meet safety standards.