Abstract: Taking the full-covering multi-step super-high dumping ground in Sichuan Province as the engineering background, the particle size distribution law of the bulk material in the dumping ground is studied based on the fractal geometry theory. The slope stability of the dump is studied, and the results show that the distribution of the bulk material in the dump has a good fractal structure, and the granularity of the bulk of each step of the fully covered multi-step ultra-high dump site distribution law is similar, and a shear strength value can be used to replace the shear strength of the entire dump. The stability of the dump site slope can be more clearly reflected by using a multi-dimensional slope stability analysis method.