Computer Supported Cooperative Work (CSCW) has been considered as a promising approach for developing process planning systems and optimizing process plans. Process planning plays an important role in the computer integrated manufacturing environment. Process planning based on CSCW is inevitable for reducing manufacturing preparation time and costs through concurrent and collaborative engineering. In this research, two key technologies of data exchange method and data communication method are studied based on the analysis of structure and business flow for collaborative process planning. The collaborative process planning system has been developed and adopted to support collaboratively work.