Abstract: Seepage in embankment and stability of downstream slope are calculated for the Hydraulic Project of Wuling, Jingshan county, Hubei Province. On the basis of analyzing the influence of the strong perviousness of the eluvial slope soil and seriously weathered sandstone in foundation as well as the downstream drainage on the seepage field in the dam,the effect of seepage on the stability of downstream slope is analyzed. The finds will be the base for the future reinforcement of the dam and be useful for the future design.