关键词: 层次分析法（AHP）, 相似度, 可拓学, 关联函数

Abstract: Around the accuracy of the case retrieval in the product configuration design, this paper puts forward a new case retrieval scheme in accordance with the conception of correlation function in extenics. According to the customization demand and the description of the product attributes, the attributes are classified to four kinds and the computing method of the attribute distance is presented based on the correlation function in extenics. The attribute weight is calculated by AHP（Analytical Hierarchy Process）. It gives the similarity calculation model and comes up with a specific example to prove the validity of the model.

Key words: Analytical Hierarchy Process（AHP）, similarity, extenics, correlation function