In order to achieve openness and reusability of simulation system, a set of intuitive and common simulation system model is established. Based on analyzing the structure of spaceflight test & launch system, as well as the relationship between its various parts, general system framework and the test & launch subsystems models are fulfilled by sorting out the existing organizing and commanding process and making requirements analysis. And on this basis, by modeling the simulation incident about a fire of explosive components testing house in the static way and dynamic, a general approach for implementation from the unified modeling language (UML) models to software application is raised. The results show that the approach allows an overall overview of the entire software structure, to grasp the entire structure and the relationship between the structures of the subsystems.