A clutch parametric CAD system based on the Pro/E has been investigated. VC + +6.0 were selected as a programming platform . With its advantages the interface of the software was programmed and intelligent design has been achieved. The asynchronous mode of Pro/Toolkit has been applied
so that designer don’t need to interact with Pro/E. Object-oriented thinking have been applied in process of software development. Friendly interface is easy to operate. The results reveal that clutch designers can improve design efficiency more than 30% with application of this system.