In order to solve the problems of insufficient information utilization and macro overall deployment of ground unit's defensive combat forces, a method of ground unit's defensive combat forces deployment based on the Jackson network is proposed to realize the modeling and optimization of ground unit's defensive combat forces deployment. Firstly, the law and characteristics of the ground detachment's defense against enemy assault weapons are analyzed, and the Jackson queuing network is used to model it. Aiming at the problem that the customer arrival rate is greater than the service rate, the equivalent transformation method of the Jackson queuing network is proposed. Then, according to the throughput and customer arrival rate of each node, the volume of customer transfer and external customer arrival rate between nodes are studied, and the penetration rate of the enemy target to the defense line is obtained. Finally, based on the game theory, a two-level iterative optimization structure is established to calculate the optimal decision of our party under the optimal attack strategy of the enemy. Simulation experiments verify the advantages of the improved artificial bee colony algorithm in solving the convergence and stability of the proposed model and the rationality of the two-layer iterative optimization structure. Meanwhile, the influence of damage probability on the decision of military deployment is discussed.