Due to the mountain’s special geological background and human engineering activities, Chenjiawan landslide was divided into landslide Ⅰ# and landslide Ⅱ# as well as potential unstable slope by the middle ridge in the plane position. By geological disasters investigation, landslide’s characteristics and geological origin mechanism were studied, and the stability analysis was evaluated. The results showed that only landslide Ⅰ# was in unstable state in rainstorm conditions. According to the landslide’s terrain features and stability analysis, combined with the situation of the protected objects, two prevention and treatment programs of “anti-slide piles drainage ditches” and “pre-stressed anchors short anti-slide piles drainage ditches” were proposed for landslide Ⅰ#. Through comparative analysis, “anti-slide piles drainage ditches“ was recommended as implementing scheme.