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Aiming at the issue of membership leaping that may occur in the conventional variable fuzzy evaluation method when dealing with exponential changing index, based on the improvement of the model, considering the fuzziness and randomness of the dam break life loss system, this manuscript promoted a model which could evaluate the human life loss caused by dam break flood. The relative difference formula was improved by logarithmic transformation and boundary constraint. The improved method was proved to be effective after applied to 4 reservoirs. The calculation result of the life loss rate and the risk level of life loss rate were consistent. This verified result and the promoted model can provide new ideas and new methods in the risk management of reservoir dams, and enrich and supplement the risk management theory. [ABSTRACT FROM AUTHOR]