In order to show the relationship between weapons and equipment intuitively and stereoscopically, an ontology construction method suitable for weapons and equipment system is proposed. According to the complexity and cooperativity of weapon and equipment system of systems (WSoS), based on the analysis of the relationship between the characteristics and components of WSoS, combined with the top-down domain knowledge map process, the knowledge map of WSoS is constructed by integrating different types and different uses of weapons and equipment. The results show that the map can lay a foundation for the construction, management and application of weapon equipment system in the later period.