In view of the evaluation problem of cooperative operational capability of UAV Swarm based on information network, the information entropy which is used to measure the degree of information uncertainty is utilized for quantifying the node capability of the network and the weight of the combat side, and a dynamic evaluation network of information flow is constructed. Through the shortest circuit algorithm with node degree limitation, a possible parallel combat ring of the network, and a minimum entropy of the network calculated by three kinds of computing methods, i.e. serial, parallel and mixed structures, are found out, realizing the quantitative evaluation of the cooperative combat action of UAV Swarm. The effectiveness of this evaluation method is verified by evaluating the capability of unmanned aerial vehicle (UAV) Swarm maritime containment and control operations. Based on the principle of maximum effectiveness, some suggestions on the cooperative strategy and operational use of UAV Swarm are given.