A CAD/CAE integrated method of customization product is proposed under mass customization environment. To improve product family design methods for mass customization, scale-based modular method is put forward. It includes two processes of product family modeling and customization product design. First of all, customization product can be achieved by changing the values of scale factors and replacement, removal of individual modules based on the product family model. Then, the main components of the new customization product are analyzed by the software of finite element analysis (Ansys). Finally, a web-based customization product design system was built.