3D information exchanging and sharing are difficult between CAD, CAPP and CNC systems. To solve this problem, under the support of the National High Technology Research and Development Program, a new approach is brought forward. In section Ⅱ of our explorative paper, a CAD/CAPP/CNC integrated system based on lightweight 3D model is established to manage the information of the whole process of product manufacturing. Fig. 1 in the full paper gives the system’s architecture and functions. In section Ⅲ, we establish an integrated information model based on lightweight 3D model by analyzing each system’s functions and requirements of manufacturing process and the process of data flowing. In order to extract manufacturing features from design features in lightweight 3D model, a feature convertor is established in section Ⅳ. And a 3D feature recognizing prototype system was established and the feasibility of this method was verified.