Abstract: In order to resolve the problem of incapable of effectively monitoring the aeronautic products developing project according to the scheduled plan, on the basis of analyzing the characters of project planning, A Hierarchical Network Planning model with independent control flow and document flow was introduced, and the principles to divide large complex project plan into some reasonable levels were suggested. Furthermore, four major steps in single level planning, firstly initializing the control flow matrix and document flow matrix, secondly tearing coupled tasks group, thirdly calculating the time parameters and key route were analyzed. An project planning software based on this model has already used in several aerospace manufacturing enterprises, and the application results shows that this model can establish and monitor the scheduled plan in an effective manner.