Abstract: Risk of reservoir junction area system was analyzed by failure modes effects and criticality analysis（FMECA）method，reservoir junction area was divided into dam area，watershed area and vegetation coverage area according to impact of its failure mode on environment and personnel.Combined with actual situation of a project in Yunnan Province，3 criteria，9 first level indicators and 28 second level indicators were scientifically selected to build vulnerability evaluation index system of whole system.On this basis，the improved fuzzy analytic hierarchy process was used to evaluate vulnerability of whole reservoir area.Results showed that vulnerability level of reservoir hub area was“general”according to calculation results，which were consistent with actual situation，proving that the method could be used for safety assessment and disaster prevention of reservoirjunction area，breaking limitation of previous single study on dam safety.