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The combat formation is a unique group organization mode in the military field, which has a wide range of military applications. For the visualization research on aggregation/disaggregation of combat formations, an aggregation/disaggregation visualization model of combat formation is proposed, which uses knowledge graph and mode-view-controller (MVC) design pattern. The main contents are architecture design based on MVC, semantic modeling based on knowledge graph, area geometry assist object construction of combat formation based on principal components analysis (PCA), aggregation/disaggregation levels of detail (ADLOD) display and map scale control of combat formation and vector representation of the visual model. This model not only makes up for the gaps in the research of combat formation in the relevant standards of military plotting, but also provides a new technical approach based on the aggregation of combat formations to simplify the multi resolution display of joint operational situations. At the same time, the visual model provides the visualization means to deepen the understanding of the battlefield integrated situation and improve the level of battle command decision making. The research has a good military application prospect.