Aviation simulation instrument is an important part of flight simulator. Conventional aviation instrument refitting method is difficult to develop and high maintenance cost. A simulation method is developed, which can exchange data and simulate the aviation instrument in appearance, display and operation. There are great significance for improving the integration and fidelity of aviation instrument simulation system. Digital design and CNC are used to make the aviation instruments panel and bezel; GLFW framework is used to render the graphical aviation instruments; hardware circuit is designed based on AVR MCU to realize real-time signal detection and lamp driving; ASCII code message is used for data exchange between simulation instrument panel and instrument simulation program. Through the test of helicopter flight trainer installation, the appearance, indication and operation response of the simulation aviation instrument is close to that of the airborne aviation instrument, which meets the design requirements, effectively improves the simulation standard and reduces the development cost. It is of great significance for the development of flight simulation training equipment.