Abstract：Yunnan province is a mountainous region of China in southwest district，and there are many rainy days every year，thus the highway slope soaked with rainwater is reliable to slide during construction. A typical project case is discussed. The slope has been treated twice with many conventional methods，such as cutting slope，prestressed anchor rope，vertical anchor，combined bolting and shotcreting to the slope surface and slope surface drainage (for the first treatment)，and grouting and anchoring (for the second treatment). However，due to the requirements of project schedule，a detailed investigation is not conducted，resulting in the failure of the slope in the following rainfall seasons，and the slope is found to crack in the top，slope surface，shoulder，and upheaval in discharge ditch and asphalt pavement. In order to find incipient fault and ensure safety of slope，the employer decided to give an overall investigation，design，and treatment for the slope. Based on a more detailed investigation，more thorough understanding of landslide，the causes for landslide，slope calculation for checking reliability，and effective schemes are proposed including cutting slope，anti-slide piles，drainage，and slope protection measures. The treatment has been verified to be satisfactory through three rainy seasons. Practice shows that the groundwater is the main factor. So the treatments to the crack at the back of landslide mass and installation of drainage system are very important. Landslide treatment is a comprehensive process，and a satisfactory result could not be expected with single technical measure，and the prerequisite of treatment is a general and accurate understanding of landslide. The failure of treatment in the first and second time，and success in the third time could function as a valuable reference to other similar landslide treatment projects.
