Architecture description and capability assessment methods aiming at the existing weapon equipment are difficult to reflect the shortcomings of the equipment association relationship on the system capability. Based on the superiority of the complex network theory applied to the networked modeling of the weapon equipment system, a weapon ring system architecture description and modeling method based on the combat ring is proposed. The weapon equipment system is abstracted into nodes, and the information flow between nodes is abstracted into the edges in the network. The capability index system of the entire combat ring is constructed based on the capability indicators of nodes and edges. Through the improvement of information entropy theory, the uncertainty of the operational mission of the combat ring is analyzed, and the specific process of the weapon capability assessment method is presented. Finally, the networked modeling and operational capability assessment of space based information support anti-missile operations are carried out, and the feasibility and rationality of the method are verified.