Hongtu Network (宏图网) is an online resource platform for engineers, designers, students, and others working in mechanical design and related fields. It provides a large, regularly updated collection of mechanical drawings, CAD files, and 3D models, with resources covering equipment, automation and production lines, machine components, robotics, molds, sheet metal, electronics, transportation, architecture, and product design. Materials are associated with software including AutoCAD, SolidWorks, Creo/ProE, CATIA, UG, Inventor, CAXA, and Solid Edge.

The site also offers course and graduation-project references, design proposals, technical documents, and learning resources. Its library includes mechanical fundamentals, engineering materials, manufacturing processes, drafting, standards, handbooks, component catalogs, and equipment-selection information. Users can find software tutorials and videos, design tools, and models or reference materials for standard parts and purchased components. A mechanical engineering community supports learning and professional discussion, while a collection of interview questions provides additional study material. Hongtu Network presents many drawings and resources for download, including materials identified as free, helping users find practical references for study and design work.