By investigating military operation, an approach to developing Unit Ontology, Equipment Ontology, Task Ontology and Simulation Scenario Ontology is proposed based on OWL. Then the concepts related to combat and the relations between the concepts are inferred and checked by reasoning based on description logic, and the hierarchy of concepts is optimized. In order to illustrate the feasibility of developed ontologies, analyses of three applicable demonstrations are presented and verified. The results show that this method achieves logically classifying for military domain concepts and intelligently checking for scenario data, and automatically supports developer in decision-making for scenario development.