This paper analyzes the system interface and control logic of a civil aircraft high lift system, and models the system by using state machine modeling tools. At the same time, the original model is modified and optimized. From the consistency of simulation verification and system test results, it can be seen that the modeling method is correct and scientific, which makes the system state flow simple and clear, and improves the efficiency of test and calibration. It provides clear state flow and test calibration process reference for the follow-up system development, especially the implementation of embedded airborne software. It lays a foundation for the research of state machine system.