Abstract:Finite element model is established according to seismogeological structure of Danjiangkou reservoir area. Then the tectonic stress field and in-situ stress field are calculated by using the software of ANSYS before the reservoir impoundment,and the distribution characteristics of stress field and plastic strain feature in reservoir area are analyzed. The results show that the horizontal deformation is dominant in the reservoir area,with the trends of NWW compression and NEE tension. Faults affect seriously the distribution of stress,and stress concentration occurs in the two sides of faults. Earthquakes easily occur in the places where the horizontal principal tensile stress is bigger or the plastic strain is concentrated. The research achievement can be reference of the induced-earthquake forecast and safety evaluation after the water level of Danjiangkou reservoir rises.