Abstract: Under the circumstances of mass customization, the low-volume variety of products must cover the function requirements by diverse customers and must have low cost like mass production, it is contradictory and the key way to solve it is reasonable and effective module partition. Based on fuzzy clustering and information entropy theory, a module partiton method and strategy that considering customer demands, assembly, cost and maintenance are put forward.It analyses the interaction rule of module clustering and quantified evaluation method based on information entropy theory and establishes a corresponding mathematic evaluation model. During the re-design of electric drill by using modular design method, the initial scheme of the module partition is obtained by using the method.

Key words: Complexity, Fuzzy clustering, Mass customization, Modular design, Module partition