When the traditional fuzzy extension model is used to appraise the dam behavior, weights of matter-element char-acteristics are usually determined by subjective weighting method, but the influence of objective factors is ignored. Through incor-porating the relation grade of matter-element characteristics with the same level into an original data matrix, calculating the weights of matter-element characteristics with entropy method, and determining the value of matter-element characteristics in the bottom with the simple correlation method, an improved multi -stage fuzzy extension evaluation model is developed. The model is used to evaluate the deformation behavior of three typical dam sections of a concrete gravity arch dam, and the simulated result is consistent with the actual situation. It is indicated that the improved multi-stage fuzzy extension method is helpful and its application can effectively avoid the subjective errors caused by human factors.%传统模糊可拓模型在大坝工作性态评价中，一般通过主观赋权法来确定物元特征的权重，而忽视了客观因素的影响。将同级的物元特征(即同级评价指标)关联度组成原始数据矩阵，再利用熵权法计算出该级物元特征的权重，而对于最底层的物元特征值则仍采用简单关联函数法确定权重，由此提出了一种改进的多级模糊可拓评价模型。随后选取某混凝土重力拱坝的3个典型坝段的变形性态进行评价，所得结果与实际情况相符，表明改进的多级模糊可拓方法可用于大坝工作性态的评价，且能避免人为确定权系数所造成的主观误差。
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