After an analysis of the demand of pilot steering quality evaluation for flight data, the model of pilot steering quality evaluation of avion is established according to the outline of flight training and the flying characteristic of avion. The system of pilot steering quality evaluation of avion which can run on the platform of normal PC is made by using the language of Visual C+[KG-*2/5]+6.0 and DirectX technology. The system can quickly recognize the flight state and maneuver action based on the expert system theory, assess the grade of flight subject automatically, redisplay the flight course realistically. So it provides a technical method for improving flight skill and insuring flight safety.