In the period of dam operation, the dam structure is suffering from complex external environment influence, and presents characteristics such as high correlation degree of qualitative and quantitative factors, a lot of missing and fuzzy uncertainty. By using the fuzzy mathematical theory the coefficients of experts’ fuzzy weight on dam health assessment are constructed, and based on this, the fuzzy weight coefficient is optimized with GA algorithm according to the maximum entropy principle. The multi-level experts’fuzzy weight model of dam health assessment is formed . Finally, the Xin’anjiang dam is selected as an evaluation example, the deformation, seepage, stress and strain and other aspects are assessed and the comprehensive assessment results are formed. The example further confirms the proposed model and has obtained good results.