In order to solve the problems of difficult development and poor maintainability of display and control logic simulation software of avionics system in current flight training simulator, a modular and loosely coupled display and control system function simulation idea is proposed, in which the display and control logic judgment and display picture simulation are designed independently. The display and control logic simulation module is constructed based on the finite state machine (FSM) theory according to the interactive, multiple input and multiple output temporal logic decision-making characteristics of the display and control system, and is implemented by Simulink/Stateflow. The results show that the design idea and structure are reasonable, the development process is intuitive, and the program is easy to maintain and transplant, which is conducive to improving the display and control logic simulation and development efficiency.