Abstract: In order to reveal the laws of dump slope deformation and damage, through the method of engineering geology drilling, the distribution laws of stratum and soft strata are mastered preliminarily. By the way of indoor scientific experiment, the physical and mechanical indexes of rock are accurately obtained. On this basis, the paper scientifically researches dump slope deformation and damage by the way of theoretical analysis and FLAC^3D numerical simulation, scientifically analyzes the dump slope distribution characteristics of internal stress and displacement, and accurately gets the laws of dump slope deformation and damage and ensures the safety storage coefficient through strength reduction method.