Aiming at the problem of modeling the command information system network by direct mapping method, the problem of modeling is not unified. Based on the normalized ontology model of command information system, a method of transforming ontology model into network topology model is proposed. Through the analysis of the standardization of the ontology model to obtain the required 3 elements to establish the network model, construction of network topology model, and the transformation of regional joint air defense command information system to realize ontology model to network model, the network model of timeliness, coordination, survivability angle out respectively to establish evaluation model, to achieve a commanding information system capacity evaluation from the overall structural level. The results show that this method can transform the command information system ontology model to the network topology model based on the analysis data, and provide reference for other ontology models on-demand analysis.