According to the independence and non-compatibility of indexes in the decision-making of water-saving irrigation and the fuzziness in the choice of indexes and criterion,a new method based on the fuzzy matter-element is proposed for the project decision.The model begins with building the matter-element of optimal subordinate degree and relational grade and calculating the coefficient of weight by standard deviation.At last,the optimal scheme is selected by the relational grade.The outcome of the application to the water-saving irrigation decision in the watersheds of the Yellow River shows that the model is feasible and reasonable.