Abstract: By analyzing the reservoir dam foundation geological condition and dam body material of Zengcheng city,this paper states that the reservoir dam body soil density is uneven,the dry density is low,the permeability is strong.The dam body maybe exist permeability stability problem.Partial soil layer of dam foundation is buried shallowly.Because of being connected by the strong permeability soil layer,the dam foundation exists the possibility of seepage destroy.It is suggested to analyze the permeability stability and research the anti-seepage reinforcement measures.