In the view of how to make it easy for the commander to make the best decision on the naval battle, this paper proposes a warship operations command and decision process based on UML. It used the use case diagram of UML to analyze the decision-making process of the executive and decision-making activities of communication, use, expansion and other relations. It used the class diagram of UML to analyze the relationship of association, generalization, composition on the entities while making decision, and it described the static logical structure of the entity. At last, it used the sequence diagram of UML to analyze the interactive relationship between different entities in the decision-making process with the change of combat time. Analysis results show that this method can make the optimal operation command decision in the shortest time, and provides a new method for the efficiency of warship operations command and decision.