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It is extremely important for effective control and management of process planning, but there are many shortcomings with traditional process planning system in these aspects. To solve these problems and meet the process informationization requirements in manufacturing enterprises, application of workflow technology in collaborative process planning system was discussed. Semantic decriptions of workflow and workflow intergrating with process planning were defined to further describe the workflow of process planning. The function structure and architecture of the system were designed based on the analysis of part process features of process planning. A workflow system of collaborative process planning was developed and workflow engine as the heart of the whole system was designed based on JBOSS JBPM, which greatly improves the control capability of the process and the efficiency of process planning.