Use of multi - level optimization technique in structural optimization design can reduce the structural weight , improve the efficiency of calculation , and shorten the design cycles 将多级技术应用于结构优化设计中，将会减少结构的计算量，提高计算效率，缩短设计周期。
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On the premise of a given set of material parameter , structural boundary shape and condition , design variables - thickness of plate and shell , is designed to minimize the structural weight subjected to the constraint conditions . 1 . for the problem with size and stress constraints , full stress design method is used to solve the sectional optimization of plate and shell structures 在给定了板壳的材料常数、板壳结构的边界形状和边界条件的前提下，确定表征板壳厚度的设计变量，在满足约束条件下实现结构重量最小： 1 .对于尺寸和应力约束的问题，使用满应力方法求解。
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The evolution laws of structural weight , the best optimum fitness , average fitness , maximum nodal stress and displacement with increasing generations are discussed . and multi - result fact of the topology optimization can be obtained by ga - fem . the research results in this thesis show that the developed method is successful in the topology optimization for 2d continuum structures under multi - load and multi - constrain conditions 上述工作表明，本文ga ? fem可以实现多载荷、多约束条件下平面连续结构拓扑优化，与eso等优化方法获得的优化结果相比，本文的优化结果不存在单元铰接和不连续单元，优化结构多样，质量更小，效果更优。
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