Due to the existence of loose sand with large porosity, gravel layer, strong fissure permeable layer, karst seepage zone, structural fracture zone and other strong permeable zones, a large amount of reservoir leakage, uplift pressure beyond the limit, or weak permeable layer appears pipe surge and other seepage deformation, so that the foundation is damaged. The dam foundation is buried deep relative to the waterproof layer and runs through the upstream and downstream of the dam foundation. The fault fracture zone with strong conductivity and the dike contact fracture zone will become the main seepage channel of the dam foundation after impoundment. The rock mass of the dam abutment is weathered strongly, the weak interlayer is developed, and the weakly weathered rock layer is buried deep, so there will be seepage around the dam foundation.