As the aircraft flight control system becoming more and more complicate ,flight test has present a mumerical tendency.Before real flight ,simulate the flight handling quality through numerical calqulation can supply a prediction and enhance work efficiency。In this article we analysed the wind tunnel data of certain type aircraft and built its aerodynamic model.On the basis of the model we developed the real time flight simulation platform by using the Flightgear software and accomplished major flight handling quality through numerical experiment.Then we choose typical real flight test data to verify our model.The comparision between the calculation result and experiment result have got a good agreement,and can supply the prediction and reference evident for the flight test.