How to satisfy individual demands as possible as product can is important for facilitating mass customization, one key technique of which is to survey easy-understood product customization model for customers. First, through fully defining product customization model and comparing to conventional product model, the formalized description of product customization model is given. Second, Analytic Hierarchy Process-based mathematic evaluation model of customization elements is established. Third, modeling process of product customization model is proposed. Finally, the proposed strategy is demonstrated effective in an instance of conference timer customization model.