The frame structure of product design system for realizing mass customization was presented based on customization demand and the problem in mass customization, and the key technology was researched. By using object-oriented technology, the component design was proposed, the product model and process of product configuration were established based on component; and the product configuration design was put forward by adopting customization demand and mapping between attributes of components, the demand parameters of parts and components were set up by using product model and customization demand, and the demand parameters matching algorithm of parts and components was given. The frame structure of the system and implementing method have been applied to the configuration system of agriculture pumps.