Aiming at the present shortcoming of strong subjectivity,weak conclusion guiding and not real-time analysis existing in dam safety evaluation,a dynamic dam safety evaluation was put forward,which took the part as object,and the characteristics times as limit.It adopted multi effect quantities to get membership of indicators,combined the information entropy theory and expert evaluating method to determine the weight of index,and got conclusions by clustering method.The method was programed and applied to Shiziping dam safety decision,the evolution process of the key parts along any time period was provided in this method,and the conclusion based on the past safe characters was much easier to use.According to the change of the monitoring data the index weight was adjusted. When the data leveled off,the weight was reduced,on the contrary,it was increased,which conformed to the actual operation.
