Abstract: A modeling method for an on-demand command and control systems（ODC2S）with unified modeling language（UML）is proposed, aimed at improving the efficiency and precision of military command and control systems. ODC2S achieves efficient resource utilization and rapid response by distributing combat tasks in the form of orders. The basic concepts of ODC2S are overviewed, the application of UML in system modeling is then introduced, including requirement analysis, system structure, and behavioral modeling, etc. Subsequently, class diagrams, use case diagrams, state diagrams, activity diagrams, and sequence diagrams for ODC2S are constructed, the static structure and the dynamic behavior of the system are demonstrated. Through these models, such key characteristics of the system as parallel processing, decision-making logic, and exception handling mechanisms, are analyzed. Finally, an instance analysis of anti-UUV operations is introduced, showcasing how ODC2S performs unified command and control, thereby enhancing the practical verification of the model.