Abstract:Considering the requirements of dynamic character analysis, fault character analysis and model-based fault detection of flight control system,nonlinear model and simulation platform of flight control system and its fault ware studied. One of classical flight control system structure was defined, and the models of rudder, force integration arm, sensor, actuator ware built. The typical failure modes of flight control system different part ware analyze, based on that, the fault models of flight control system different part ware built. From this, simulation platform of flight control system and its fault was development based on MATLAB/Simulink, which can simulate dynamic character of system and its fault easily. Based on simulation testing, the rationality of model and simulation platform of flight control system and its fault are verified.