The reusability implementation of large-scale simulation model architecture is an important way to improve the development efficiency of the simulation system. The main idea and the bottleneck of current model reuse methods are analyzed, a basic structure of the simple model and combination model in Agent based Simulation Model (ASM) is designed to realize the hierarchical system. The dynamic combination method of ASM is studied and the mapping relationship between the model elements under the different combination form is analyzed, and the extended matching rules for professional domain constraints are studied. By the example of a space combat simulation, the practicality and feasibility of the modeling method were demonstrated.