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To shorten the design period of airplane, improve the design quality and reduce the manufacture cost, the computer supported cooperative design has become one of the effective methods. In order to organize the airplane design coordination tasks reasonably and improve the group collaborative efficiency in CSCD, an airplane cooperative design model based on task-related work breakdown structure was presented. The task-related WBS defined the dependent relations among the task nodes to describe the feedback and precedence constrains. An algorithm is applied to map task-related WBS to the Petri net-based process model to design and analysis the airplane cooperative design workflow process. The design management platform was established by using J2EE and JBPM techniques for the airplane general arrangement and coordination. The effectiveness and applicability of the method was verified within the application of some type airplane's general arrangement and coordination process.