As a good ground simulation equipment, flight simulator has many excellent characteristics. With the aid of a flight simulator, flight characteristics research and flight training can be carried out effectively. When designing and manufacturing, it is necessary to evaluate the simulator to meet the requirements of research and training, and the research on evaluation methods has become the key content. The research status of fidelity evaluation methods was summarized. The structural model method and the cybernetics method were summarized emphatically. It clarified that due to difficult evaluation methods and standards, the evaluation effect was difficult to compare. The difficulties faced by objective evaluation methods were analyzed, and the future research directions were prospected