First of all, 1:500 topographic map and geological mapping are carried out for the distribution of landslide body and its surrounding influence area, the mapping area is 0.155KM2. The main task is to find out the geological structure features (bedrock distribution, lithologic segment division, Rock mass structure, fracture development degree, etc.) , landform and microlandform features (plane shape, surface slope of landslide body, etc. . Surveying and mapping various deformation signs of the landslide body, analyzing the mechanical characteristics of the landslide, accurately determining the range and boundary of the active landslide body.