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To avoid repetitiveness and invalidation in product configuration, in this paper, a new approach to configuration design based on customer requirement's priority is presented. Firstly, a configuration model is constructed and translated into CSP model. Secondly, in the stage of interactive configuration, customer configured more important issue earlier than other issues. The check configuration process has to reduce the variant space provided by the CSP model with regard to the outcome of the previous configuration. As a result, customer demands with consistency and reduced configuration structure are achieved. Finally, under the optimization conditions of customer wish requirement, the reduced configuration structure is optimized to gain final BOM of the configured product.