Abstract:Traditional product defi nition technology, mainly uses engineering drawings, which illustrates geometric structure and manufacturing requirements of product by drafting on papers, and is used to share and delivery design and manufacturing information. Model based definition is a new method completely, with the core of the 3D model. It integrates information of design and manufacturing into the model, allowing the CAD and CAM (processing, assembling, measuring, testing), etc. to achieve high degree of integration, no longer uses engineering drawings.