The concerns of the technology of the reusable component are increasing for producing the software effectively and developing the products quickly on demand of customers. Technologies of composition and dynamic reconfiguration of the component are needed to develop the simulator of the weapon system in field of national defense. It is needed to develop the surface to air missile simulator as the example of the weapon system through component-based development. In order to develop the simulator, creation of components of the simulator is required and the process of reconfiguration is defined and realized. The process of reconfiguration consists of four parts: management, semantic test, composition and performance evaluation. In first part, the developer can easily create lots of component models including characteristics of the product of the weapon system and quickly manage them by using the management tool. In second part, semantic tester tests that whether the reconfiguration and import in the simulator are possible or not. In next part, the composer constructs the product models configuring surface to air simulator by composing existing component and newly created component. Then the results of construction can be entities of detecting radar, the surface to air missile, the launcher of the missile and aircrafts of the simulator of the weapon system. In last part, the existing 3D-based simulator for evaluating the performance of the component of the weapon system confirms the effects of reconfigured components by importing it. Therefore, this study provides basic framework to simulate common weapon systems through the technology of composition and the process of dynamic reconfiguration.