In order to improve the sustained support ability of early warning intelligence system-of-systems （EWISoS） in the process of combat， the structural adaptability of EWISoS under confrontation is studied based on complex network theory. The composition units， internal and external interaction relations and hierarchical structure of EWISoS are analyzed around the early warning intelligence process， and a dual domain network model including information domain super network model and physical domain communication network model is constructed. The index to measure the adaptability of network structure is proposed， the architecture countermeasure simulation framework is designed， and the repair method of network structure is given. Simulation of the network model and framework is performed. Through simulation experiment analysis， the influence laws of inter domain dependency and repair methods on the structure adaptability of EWISoS are found. The experimental results can provide scientific guidance for the continuous and efficient operation of EWISoS， and the modeling method and simulation framework can provide reference for the research of complex systems in military field.