Based on fault tree and vague set theory, an model of evaluating criteria of dam risk, in order to improve deficiency of traditional assessment method, such as lack of fuzziness and flexibility, and to be used for making safety and reliability evaluation for complex systems, is put forward.

The dam risk management decision support system under disaster load is a complex,large-scale system and it requires a lot of professional with various backgrounds to participate in.

Through analyzing the relation between the dam engineering behavior and its hazard likeliness, we have developed a dam hazard degree evaluation mode based on the logistic growth curve we have set up, and a real-time safety quantitative linear weighing appreciat.

The basic theories,methods and status of research concerning dam risk analysis are outlined in this paper.

The dam risk analysis technique established on the basis of the probability of dam failure and the estimation of loss of life and economic loss has been widely applied to dam risk management abroad in recent years.

In recent years dam risk analysis and management established on the basis of the probability of dam failure and the estimation of loss of life and economic loss has been an advanced technology to dam safety management.