3^# line Changsheng dump of Yuanbaoshan is a typical loess base dump, before it is employed, the dump slope stability must be evaluated. The formation of the dump is not instantaneous, but is slowly filling up. For the operating process of comprehensive dumping machines, a rigid body limit equilibrium method of different high slope dump is used to calculation slope stability. And FLAC 3D is adopted to simulate the deformation of the dump slope. The numerical simulation studies the impact of the basement and groundwater unsteady factors on the slope stability, reveals the rock slope deformation and land slide displacement law model, conducts a scientific evaluation of slope stability, and provides a reliable basis for the safety of the mine production.