Concrete dam health state has been taken seriously in the field of structural health monitoring. A limitation in the current research is a lack of clear physical significance and reasonable interval division for better reflecting the development trend of the health state. This article introduces a comprehensive evaluation method that provides information on the fusion of different monitoring types and influences of degree weight. The analysis method of variation tendency for concrete dam soundness is proposed based on gray theory. According to the principle of analytic hierarchy process, this article introduces an optimization division method of evaluation grade interval for concrete dam health state. Based on this, a method based on multiple monitoring quantities is established through studies of determination methods for monitoring various quantities of weight, which aimed at evaluating concrete dam health state and solving the problem of comprehensive evaluation for concrete dam health in an effective manner. An existing concrete dam is presented and discussed to serve as the validation of the established theory.
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