The work aims to study the loading model, to improve the loading rate of air material packaging unit in combined multi-compartment container, thus providing a technical method for container loading work of the army. According to the size of air material packaging units to be loaded and container, the segmentation scheme of container interior was analyzed. Considering the constrains of loading volume, loading weight, floor area and center-of-gravity position, a mathematical model was established with comprehensive space utilization and loading capacity as the objective function, and genetic algorithms were used to perform optimization calculations for each segmentation scheme, to determine the best segmentation and loading scheme. Taking 26 air material packaging units to be loaded into B9 type combined container as an example, the optimal loading scheme was to divide the interior of container into three layers to load 16 air material packaging units, thus the space utilization of container reached 86.25% and the stability of the loaded container was good. This algorithm model can effectively optimize the loading scheme for the air material packaging units, improve the loading efficiency of the combined containers, and have important significance for accelerating the transportation of military materials.