The modular design of serialization, standardization of fixture components, quickly assembled into a variety of fixtures, has become the basis of fixture technology development. Save labor, save time, save material, save energy, reflect in the innovation of various advanced fixture system. Modular design for the fixture computer-aided design and assembly of the foundation, the application of CAD technology, can establish component library, typical jig library, standards and user use of archives, jig optimization design, for the user three-dimensional solid jig assembly. Simulates the cutting process of the cutting tool, can not only provide the correct, the reasonable jig and the component matching program for the user, but also can accumulate the use experience, understand the market demand, and continuously improve and perfect the jig system. In cooperation with huazhong university of science and technology, jigs chapter is starting to build a professional website of jigs, providing a public platform for information exchange, jigs product consultation and development for the jigs industry, striving to achieve the universality of fixture design and service, remote informatization and e-commerce. The versatility of general and economic jig directly affects its economy.Adopt modular, combined fixture system, one-time investment is relatively large, only the fixture system of recombination, reconfiguration and scalability of strong function, wide application, good universality, fixture utilization rate is high, quick investment recovery, to reflect the good economy. German demmeler (demmeler) company's hole series combination welding jig, only with a few varieties, specifications of supporting components, that can be assembled into a variety of welding jig. The function of element is strong, make the jig universal good, element is few but fine, the cost of form a complete set is low, economy and practical ability has the value of popularizing application.