Landslide is quite regular in steep rock slope due to the engineering geological condition, hydro-geologicalcircumstances, and some human activities, For the landslide formation feature, the geological condition and the hydro geological condition of Masangba tunnel of Wudu-Guanzigou Expressway, several kinds of working conditions of this land-slide is analyzed by using flac3d. Finally, the reinforcement scheme is proposed and proved to be effective.