Abstract: Inner Mongolia in winter snow is thick, the spring temperatures rise quickly, a lot of snow water in slope and retaining wall back in fine sand layer. Due to the drainage hole at the upper part of the lower slope and retaining wall most jam, water can not be discharged. Melting snow along the slope surface flow, resulting in instability of slope deformation. The rise of ground water level, serious water retaining wall, according to the principle of soil into account in calculating soil pressure on retaining wall, retaining wall is easy to slip.