In order to evaluate the capacity of the safe return channel of offensive operations in the time and space of military aviation warfare, this paper proposes the node confluence control cellular automata model (MRCA model). According to the configuration of the safe return passage in air attack operations, focus on the operational characteristics of nodes at the intersection of the passage, quantify the safe spacing of nodes into the confluence rules, and study the maximum flow of the passage before and after the nodes under different acceptable spacing conditions. And based on the traffic operation characteristics of the channel before and after the node, the minimum risk channel entry time window is established to move forward the time node of capacity balance regulation, eliminate the potential conflict of the fighter at the node in the strategic management and pre tactical management, and achieve the maximum traffic capacity. The simulation results show that the channel capacity increases with the decrease of the interval after the node confluence, and the maximum is 102 frames/h. Within the time window that the minimum risk channel can enter, the MRCA model is used to dynamically control the aircraft at the decision circle, which can ensure the safe confluence of nodes and maximize the flow.