The stabilities of two landslides are the most important issues of a hydrepower station in the upstream of Daduhe upriver.The purpose of this paper is to investigate engineering and environmental conditions of the two landslides and study their deformation charateristics and failure mechanism

influencing factors and cause of formation.On the basis of qualitative analyses

representative profiles and typical working conditions are chosen.By using the slope anlysis program（Slope CAD and TB.exe）

synthetical quantitative analyses are made of the stabilites of landslides.The sliding velocity of local landslides and the height of surging waves are estimated using the method of energy advised by the American Society of Civil Engineers and the empirical method proposed by China Research Institute Water Resource.The degrees of possible damges caused by the landslides are evaluated to the dam

lives and properties.