Abstract: In order to identify and analyze the risks in hydropower project comprehensively and systematically, to avoid the problems of repetition, crossing and omission, a risk identification system was constructed based on HALL three dimensional model of risk identification. Before constructing the system, the construction project was divided into several professional sections, and then the risks were identified based on the professional sector subsystems. On the basis of point, line, surface, body, operation flow was taken as the main line. Scientific identification methods such as failure mode and effect analysis (FMEA), job hazard analysis (JHA), operation conditions risk analysis (LEC), preliminary hazard analysis (PHA) were applied to equipment facilities, operating processes, personnel positions and environmental atmosphere, four specific management objects, then, a dynamic risk factor database was formed. Finally, the reconstruction project of a hydropower station was taken as an example, to which this risk identification system was applied. The results show that the system can be used to identify risk factors in hydropower project comprehensively.

Key words: hydropower construction, HALL 3D structure, risk identification, "point-line-surface-body", identification mode, database