描述了模糊集之间的相似度量与加权相似度量方法以及机械设计方案决策新方法在机械设计方案决策中模糊集之间的相似度量是评价机械设计方案接近期望方案理想方案的测度相似度量值越大机械设计方案接近期望方案越好通过实例阐明模糊集之间的相似度量在机械设计方案决策中的应用是可行的 The similarity measure between fuzzy sets and weighted similarity measure method and the similarity measure between the new method of mechanical design scheme decision-making and the fuzzy set in the mechanical design scheme decision are described. The similarity measure is the measure of similarity between the fuzzy scheme and the ideal scheme of mechanical design scheme. The larger the mechanical design approach is, the better the expectation solution is. It is feasible to clarify the similarity measure between fuzzy sets in the decision of mechanical design through examples