Abstract: With the construction of large and medium sized reservoirs, a lot of fording slopes appear and the change of reservoir water level will influence the slope stability, which would lead to landslides, even geological hazards. The stability analysis becomes very complicated since the fluctuation of water level would cause unstable seepage for the underground water inside the slope. At present, researchers mostly adopt the methods of empirical generalization or copy standards in practical engineering, which will make the design subjective and qualitative. So the researches on the methods of stability analysis are significant to engineering safety, environment protection and hazard prevention both theoretically and practically. In the paper, some achievements of stability analysis by the authors are introduced, including the solution to phreatic surface during the change of water level, the application of strength reduction FEM in stability analysis and the application of embedded anti-slide piles in the controlling engineering.