CREO (professional/engineer) has a broad user base. Pro/Engineer has the characteristics of advanced parametric design, solid modeling based on feature design and easy transplantation of design ideas. The software conforms to the mechanical design idea of engineers and technicians. Pro/Engineer has more than 20 modules for users to choose from, so it can integrate the whole design and production process. In recent years, Pro/Engineer has become the most attractive software in the field of three-dimensional mechanical design, and has been widely used in Taiwan Province Mould Factory. In the early years, it was run under the Unix system of the workstation, and later, due to the poor usability of the software waterfall interface, the "Wildfire Edition" was launched, but the software operation was still cumbersome and difficult to get started. Because Pro/Engineer has laid a solid foundation in its early years, has a large number of old users and has very comprehensive functions, it is still a very powerful CAD system in the market. With the huge market pressure and other CAD systems encroaching on users, PTC launched Lightning Project on 20 10, and invested 200 million dollars to develop a brand-new CAD system CREO, which integrates parameterization technology, direct modeling technology and visualization technology. The latest version is CREO5.0.

Unigraphics Unix has strong technical strength, so it is difficult to meet its rivals. Unigraphics originated from the products of McDonnell Douglas (MD) in the United States. In the early years, it was suppressed by Pro/Engineer, and 19 1 was acquired and purchased by American General Motors EDS Branch. Unigraphics was developed by UGS, an independent subsidiary, and then integrated with the I-deas software of SDRC Company, which was also purchased, to launch UnigraphicsNX, a high-end CAD mechanical engineering auxiliary system, which is suitable for the design, analysis and manufacturing engineering of aviation, aerospace, automobiles, general machinery and molds. UnigraphicsNX combines the traditional functions of solid, wireframe and surface, and has excellent parameterization and variable technology. After the acquisition of Siemens, UG achieved all-round development. Now the position of Unigraphics NX is beyond Pro/Engineer's reach, and its only rival should be CATIA. The latest version is UG 12.0.

CATIA is on the top. CATIA, the top CAD system, is a high-end CAD system developed by Dassault Aircraft Company of France. It has many modules. In the early years, it ran on the Unix system of the workstation. As we all know, Dassault was once a French military enterprise. CATIA software enjoys a high reputation in aircraft, automobile, ship and other design fields because of its powerful surface design function. The surface modeling function of CATIA is that it provides rich modeling tools to support the modeling needs of users. For example, its unique high-order Bessel curve and surface function can reach 15 times, which can meet the harsh requirements of special industries for surface smoothness. CATIA has a stable market and has never had an opponent. Its powerful function should be said to be unmatched by any 3D CAD system. The latest version is CATIA V6.

SolidWorks started late, so it can use more advanced technology to develop software. Therefore, the whole system framework of SolidWorks has strict design, comprehensive interface and humanized interface. SolidWorks was established in 1993 by the technical vice president of PTC Company and the vice president of CV Company. SolidWorks was developed in June 1995+0 1. At that time, it was the first CAD system for full parametric feature modeling based on Windows platform. Due to the excellent technology and market performance of SolidWorks, SolidWorks was finally acquired by Dassault 1997 with a high market value of 3. 1 100 million. The original shareholders of the company got a high return with the original venture capital of13 million dollars, which created a world record in CAD industry. SolidWorks is a 3D CAD system with the largest market share in the world. It is a software system with technological innovation and has become the standard of three-dimensional mechanical design software.