With the acceleration of mountain highway, it is unavoidable to induce landslide disasters in many road constructions. Take Shawosi landslide as an example, this paper analyzes the history of slope deformation, the characteristics of the landslide boundary and the slope body stability, the conclusion is that the landslide body is in a slow creep stage and belongs to a medium-sized landslide. In the case of 20-year severe rainfall, the slope is in an unstable state and may slip again. According to the distribution range of the landslide bodies, the dangerous area range and the nature of the landslide, the treatment measures of sheet-pile wall and back edge crack landfill with drainage ditch is are proposed for control the slope deformation, which can provide example for the treatment of highway slopes.