Abstract: To analyze the complicated C⁴ISR requirements,the paper proposes a systematic approach to capability requirements acquisition and analysis.It suggests that the acquired process be initiated with mission analysis by modeling the operational mission goals and task scenarios using UML modeling technology,and then the conceptual models of the C⁴ISR capability requirements can be automatically established through analyzing the mission activity models.Furthermore,the capability concepts are formally described using an ontology description language(OWL DL),which can check the model integrity and consistency by using a symbol inference system.A demonstrational example is provided to show how to use the method,and experimental tools are applied to demonstrate its availability.