Abstract: This paper introduces the basic survey data, using the discrete element numerical simulation software UDEC to establish model, contrast slope under two kinds of transient storage. The stress field, strain field, strain(displacement) and the distribution of plastic zone were analyzed. At the same time calculation of the phreatic line slope water level change by using the software of GeoStudio Seep module, and used to calculate the stability coefficient changes in the water level dynamic state of Slope module based on the principle of coupled Sarma method. The results show that：the water before the local deformation, the front and back of large deformation after water storage, in front slope prone to buckling; water level rise in the overall stability of the slope was significantly decreased during the period, the overall stability of weak lower.