Abstract: A series of tensile cracks and lower fault cracks appeared in the buildings (structures) on the top of the slope in the survey area. Comprehensive survey methods are applied to find out the distribution of the fill, including geological survey, geological process analysis and slope structure analysis. Through the analysis of geological process, combined with the geological structure of the slope from the perspective of crack formation and evolution, the main factors of disease formation are analyzed. High and steep terrain, thicker fill, unfavorable stratum contact and continuous vehicle load are the main factors, and the slope is during the creep deformation stage. A three-dimensional geological model is established, and the stability of the deformation zone is evaluated through limit equilibrium method and numerical simulation. It is concluded that the unstable slopes of 1^# and 2^# are basically stable, and the 3^# unstable slope is during uneven settlement, which should be monitored more closely, and further treatment should be taken according to the monitoring results. According to the monitoring data of the past year, the slope deformation trend has slowed down, and all indicators are normal, which provides a basis for prevention suggestions.