With the application of traditional CAD system in industry and the complexity and intelligence of modern design problems, people are no longer satisfied with using computers instead of manual drawing. Fortunately, with the development of computer graphics, artificial intelligence, computer network and other basic technologies, as well as the research of modern design theories and methods such as computer integrated manufacturing, concurrent engineering and collaborative design, CAD systems have also developed from simple two-dimensional drawing to three-dimensional intelligent design, physical property analysis and dynamic simulation, parametric design to variable and VGX (hypervariable), geometric modeling, surface modeling and solid modeling to feature modeling and semantic modeling. On the other hand, with the increasing complexity of CAD software and the practical need of interoperability between different application systems, people hope that CAD systems have excellent openness and can be assembled freely like building blocks to form different functional configurations. The research, application and gradual maturity of software engineering technology, especially component development technology, provide a solid foundation for solving this problem.