Abstract: In order to identify and evaluate the social stability risk of water conservancy and hydropower projects,a fuzzy grey correlation fault tree model for risk assessment is established. The model uses triangular fuzzy number to represent the fuzzy probability of the basic event;calculates the fuzzy probability of the top event and the fuzzy importance of the basic event;takes the fuzzy importance of the basic event as the reference column,takes the characteristic matrix composed of the minimum cut set as the comparison column,and calculates the grey correlation between the fault mode represented by the minimum cut set and the top event by calculating the correlation coefficient. A case study of Qianping reservoir shows that resettlement is the main risk factor of the reservoir construction,which is in line with the reality of reservoir construction. The model is suitable for dealing with complex system problems,and can provide reference for the social risk assessment of water conservancy and hydropower projects and the establishment of scientific early warning mechanism.