研究了同时考虑拱坝“体积最小”和“最大拉应力最小”的两目标优化设计 .采用线性加权的统一目标法求得非劣解集后 ,利用模糊贴近度从中选取最优解 ,讨论了不同隶属度和贴近度公式的影响 ,给出了最优解的简便几何求法 .某拱坝算例分析说明本文方法有效 ,并显示了两目标优化体形的一些可供设计参考的体形特征 . This paper studies two-objective optimization design which considers both “minimum volume” and “maximum tensile stress” of arch dam. After obtaining the non-inferior solution set by using the unified weighted linear target method, the optimal solution is selected from fuzzy close degree Different degree of membership degree and closeness degree formula, a simple geometrical method of optimal solution is given.An example of an arch dam shows that this method is effective and shows some shape features that can be used for design reference.