Model-based design is nowadays the development trend of the embedded system software design, and modeling the embedded system and auto code generation by models are the key technologies. Quantum framework, as an event driven framework, can be used as a supporting platform for embedded software. Stateflow model is suitable for describing the logic control function of embedded system, and the C code can be automatically generated from the model directly by using the RTW tool. In this paper, a flight control system is used as an example to design the active objects and events, and the Stateflow model of the sequential control function is established and simulated, finally the C code is automatically generated and integrated with the quantum framework. In this way, the software of flight control system is designed. The research shows that the quantum framework can support the codes generated by Stateflow model automatically, and the combination of them can realize the application of model-based design in embedded system software design.