Abstract: A combat concept of systematic fight under long-range information support by unmanned aerial vehicle is proposed, and the OODA loop of longrange combat is established. Armaments system-of-systems are analyzed particularly, explored the design method of the nodes and sides of operation network model, established the operation network model. On the basis of the concepts of information entropy were referred to measure the degree of information uncertainty contained in operational activities, presented the measurement for assessing the armament system-of-systems operation capability. By instance analysis, the efficiency and believability of assessment were explained. Get the nodes which affected the operation capability deeply, contrasted the operation capability of different loop, gave some suggestion of information flow.