Abstract: The link segment of Qinggangzui Bridge abutment and Gangzishang Tunnel portal in Yalu Expressway will be built on the ice deposit fan on the right bank of the Dadu River.Because of the water storage of Pubugou Hydropower Station,about a quarter in front of the bank slope will be underwater.The main geotechnical material impacting the entire slope is the ice deposits composed by upper-middle PleistoceneIce ice sediments and ice water sediments.Under the action of water,their physical and mechanical properties and strength will be significantly changed.Their engineering behavior will be weakened.Thus the bank slope stability and the abutment arrangement will be affected.It can be foreseen that the water from the external conditions will play an important role and the reservoir bank reconstruction will generally control the bank slope stability.In this paper,the reservoir bank slope in Yalu Expressway is discussed because Gangzishang Tunnel portal is to be constructed on the slope.Through the slope engineering geological conditions,rock and soil structure and mechanical properties,the analysis of factors affecting slope,the water impact on the banks as well as the slope stability are mainly discussed.The used methods are Cacho,Two Sections(Multiple),Limit-equilibrium for the analysis of the water impact on the reservoir bank and to predict recycling width.Forecasting results from the three methods all show that different parts of the slope will have bank collapse in different degrees after the Pubugou Power Station is impounded.According to the structural characteristics of the reservoir bank slope and the three methods of application conditions,this paper puts forward an integrated prediction method that different forecasting methods need to adopt at different sections of the reservoir bank slope.The Two Sections(Multiple)method is used to forecast the underwater bank slope.For the slope upon water,the calculation results of Cacho method and Limit-equilibrium method are comprehensively considered.The results can also be used for stability analysis of similar reservoir bank slopes.