system design plan Wrapped bushes die CAD system development is based on the Windows P operating system, the use of visual programming tools for Visual C 6.0 on the existing ten dimensional CAD software, UGS 180 for secondary development. Database management system uses Access2000 database. Wrapped bushes die CAD system is a wizard system that can guide the user in accordance with certain steps to complete plastic mold design injection mold design the roll sleeve mold design work, change the use of traditional CAD Design Software Development mold too dependent on the experience of experts or engineers, tedious development process and the shortcomings of a long development cycle. Wrapped bushes die CAD system is rolled sleeve mold CAD / CAE / CAM system, some computer-aided design is based on UG as a support platform, Visual C integrated development environment (IDE) under the use of UG / OPEN API Interface Programming, Manuscript plastic injection mold design menu integration technologies, development of the system is fully integrated into the mold in the UG CAD system. The main task of system design is to determine the system modular structure, the establishment of system function module. It includes the system is divided into several plastic injection molding process l modules, determine the interface between the module and the evaluation of the quality module division. Volume bushes under the mold design requirement, the system mainly to complete the work of four parts: product data modeling, process design and analysis of stamping, mold design and molding process analysis.