With the application of advanced science and technology in the military field, modern warfare has developed into a confrontation between systems. The Combat System-of-Systems (CSoS) have numerous nodes, multiple attributes and complex interactions, thus its research and analysis are facing great difficulties. Electromagnetic space is an important dimension of modern warfare, thus modeling and analyzing the CSoS from electromagnetic space are of great significance to solve the above problems, and can provide reference for the research of electromagnetic warfare. This study proposes a general modeling method for transforming from real CSoS to networked model. Firstly, the nodes and relationship types in the complex electromagnetic space CSoS are divided, and then the important attributes of the combat nodes are extracted, and the relationship weights are normalized, so as to establish a networked model that is easy to further analyze and calculate. Finally, an example of attack-defense confrontation of aircraft carrier formation is constructed for verification.