In order to improve the design quality and efficiency, put forward a component based on ontology and knowledge of machine design method. Use ontology and knowledge component design knowledge representation and modeling, construct high and low machine design knowledge base, based on ontology and knowledge of high and low machine design method, develop and design high and low machine design system based on Java platform. And it is verified with certain type high and low machine design examples. Verification results show that the method and the development of the design of the system has the feasibility and effectiveness, call the corresponding knowledge components in turn according to the given design process in the ontology, display related design knowledge in real-time, and help design personnel to complete the cumbersome and repetitive calculation work.