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Robust description index and robust topology optimization model. The robustness design requires both the average performance of the structure and the structural performance offset caused by the uncertain parameters of the structure. In order to describe the robustness of the design requirements and component optimization model, according to the weighted objective function in the form of structural flexibility and expectation and standard deviation of weighted coefficient selection rules, is proposed, called a "class variation coefficient" flexibility suitable steady description index. The index has a clear physical meaning and more reasonable.