A construction principle of evaluation index system and an optional index set of risk and benefit is presented with regard to safe and reasonable utilization of flood resources.Based on the multilevel fuzzy optimization theory

the concept of entropy weight is applied to constract a comprehensive evaluation model of risk and benefit of flood resources utilization.In accordance with different utilization patterns and evaluation ranges

the model uses risk tree analysis to identify risk factor

utilizes the coupling method of function and demand to identify benefit indices and composes evaluation index system accordingly;and it utilizes entropy values to determine weight vectors of each index and uses variation degree of the indices to reflect effectiveness degree of information

consequently the anthropogenic factors of weights are eliminated.The model is applied to evaluate the risk and benefit of flood resources utilization of Yueliangpao Reservoir in Baicheng City

and the evaluation results is highly rational

reliable and practical.Consequently

the model can not only be used for optimization of different schemes but also for evaluation of each scheme.It can be a basis of decision-making in scientific utilization of flood resources.