Studying the operational process of fleet air defense C4ISR system, take the background of the USA AEGIS fleet air defense system. Analysis the structure of the AEGIS and the AEGIS open architecture, introducing design approach of DoDAF architecture and giving the develop process. DoDAF is adapted in the modeling process of AEGIS air defense; operate resources, relationship of nodes, information bearing are described by the different operational views. The results show that the system can provide multi-perspective description of the system, providing auxiliary basis for operational decision-making and engineering personnel to improve system performance.