The design scheme evaluation is an important part of product intelligent design system, but the existing scheme evaluation methods have not considered the problem of the mutual influence of the evaluation index, thus reducing the objectivity of the evaluation result. In fact, the influence relationship of the scheme evaluation index is a kind of tacit knowledge which exists in the expert's mind. Therefore, this paper introduces the fuzzy cognitive maps, which is a tacit knowledge expression

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... l, to model the influence relationship among the evaluation indexes. This modelling process has two interconnected parts: the modelling process of domain variables and the modelling process of causal structure. And this modelling process has the meaning of guiding the practical operation, and laying the foundation for further creating a more optimized scheme evaluation method. International Symposium on Material, Energy and Environment Engineering (ISM3E 2015)