Abstract: For realizing performance requirement-driven product design, the organization of existing knowledge is very important. A scheme to organize and describe the knowledge of existing products is put forward, in which the concepts of product performance cell is defined. An object-oriented definition and realization of performance features is presented to simplify the extension of product database and carry out the operations such as classification and storage of cases. Performance feature not only connects requirements of consumers with the final product design, but also makes it possible to reuse knowledge of existing products and their ways of design in the future works.