针对概念设计阶段评价指标及重要度不确定、信息模糊、不完整的特点 ,在模糊理论的基础上提出了一个三层模糊优序评价模型 :模糊预序评价模型 ,模糊半优序评价模型 ,模糊全序评价模型。该模型为概念设计的评价提供了一个较为合理的依据。在文章的最后给出了机电产品的一个应用实例。 Based on the fuzzy theory, a three-level fuzzy sequence evaluation model is proposed for the conceptual design stage evaluation index and uncertainty degree, fuzzy and incomplete information: fuzzy pre-order evaluation model, fuzzy semi-optimal evaluation model, Fuzzy total order evaluation model. The model provides a more reasonable basis for the evaluation of conceptual design. At the end of the article gives an example of the application of electromechanical products.