Use of digitization clothing technology, the customer demand information flow of mass customization for clothing industry was analyzed. The mathematical mapping ways which can be identified by system from these demands were proposed. Combination with three specific process of customization, design, production of mass customization for clothing industry, the information conversion technologies were studied, respectively, from customer demand to orders, from orders to design program ,and from design program to clothing . The customization system configuration in the clothing industry was designed on the basis of Web. The information conversion and systems integration were achieved by PDM.