Shihutang Navigation-power project is a comprehensive utilization project,which is mainly based on shipping and has the benefit of power generation and flood control.The protection engineering for reservoir region of this project consist of Taihe protection zone,Yanxi protection zone,Wanhe protection zone,Jintan protection zone and Zhangtang protection zone.After storage,immersion phenomenon took place in the partial dykes of Wanhe protection zone and Yanxi protection zone whose ground，elevation is below the backwater surface when the normal water level is 56.5 m.According to the scene investigation,after comprehensive analysis the treatment measures such as lifting field,founding drainage ditch and relief well is adopted.