Abstract: Establishing modular product platform is a key problem for realizing product family design.By analyzing the process of product development and components commonality matrix,the degree of commonality among components is worked out and taken as the clustering index.Components are classified to different clustering categories by using fuzzy analysis.Tables of optimal fuzzy matrix and relevance degree of membership classification are formulated to offer a qualitative basis for the final clustering of components,case study is given to illustrate the proposed approach.