With the improvement of computer information management technology and the deepening of enterprise information construction, how to integrate computer aided design (CAD), computer aided process planning (CAPP) and computer aided manufacturing (CAM) systems and realize the free conversion of data and information between CAD, CAPP and CAM systems, so as to improve the product development efficiency, which is a problem that many enterprises pay more and more attention to. CAD, CAPP and CAM integrated system framework based on PDM is proposed, and the customization content and implementation technology involved in the implementation of the framework are researched in depth.