Abstract: Wuxi county is tectonically located at the core of the southern Daba Mountain arc-shaped folding belt and the northern edge of the octagonal mountain arc-shaped folding structure belt, and is geographically located in the north of the Fengjie-Wushan section of the Three Gorges Reservoir area, where the nearly-parallel folding structures mainly occur and the joints and cracks in the rocks are developed. The topography of the region is characterized by strong cutting and undulating features. It is of high and middle mountain canyon landform, large annual rainfall, and fragile geological environment conditions. In the study area, large rock landslides with high-location and high-risk clastic flow is mostly developed, which have the characteristics of strong concealment and great danger. On the basis of Lidar image analysis and detailed field survey, a detailed analysis of the characteristics of the landslide geology environment background, the characteristics of the landslide and the accumulation process are carried out in this paper. The results show that the weathering of big thickness, high and steep topography, the structure of the special conditions, typical slope structure are the main factors of landslide development. Continuous rainfall is a direct causative factor for the development of the landslide. The collapse of the Permian caving of the carbonaceous limestone and limestone in the upper part of the slope is an important factor leading to the instability and transformation of the Silurian siltstone debris or residual overburden in the middle and lower parts of the slope into clastic flow. Aiming at this kind of high-risk debris flow landslide, this paper puts forward the disaster mode of high-location collapse sliding → high speed initiation → collision disintegration → high speed shovel scraping → projectile accumulation, which may provide a technical basis for prevention and treatment of this kind of landslide in the Three Gorges Reservoir area.