It has been discussed in this paper that the necessity of knowledge support technology used in creative design of electromechanical products. In order to apply knowledge support technology to creative design of electromechanical products, a relation matrix has been constructed by QFD (Quality Function Deployment) technology between the various performances of electromechanical products and the involved knowledge of them. Thus, the HOQ (House of Quality) about the knowledge–performance of electromechanical products is built. Then, the further demand tracking has been made as well. After that, it has been established that the knowledge model and knowledge application process used in creative design of electromechanical products. Finally, a new method has been proposed which can guide designers to do product creative design by knowledge demand.