In Flight Thrust Determination (IFTD) is timeconsuming, experimentally expensive and includes numerous test points. In order to improve the efficiency of flight test sorties and ground monitoring, and reduce the cost of sorties, a physical oriented integrated airground simulation model system was developed based on FLIGHTLAB software. Kalman filter and genetic algorithm were used to process and optimize the input data of the model. Monitoring interface of airground integration was developed based on QT which was applied in IFTD flight test of a certain type of aircraft. The result indicates that the integrated airground model can effectively simulate the engine operation and dynamic response of a certain type of aircraft, the average error of engine parameters is around 3%. The realtime data processing and dynamic optimization algorithm can well match the integrated airground model and ensure the operation of the system effectively. During a certain type of aircraft’s IFTD flight test, 3 tons of fuel was saved within two sorties by applying the model. This application shows that the air ground integration technology can provide support for test point accessibility analysis and test point optimization configuration analysis before flight, and reduce the burden of flight test monitoring in flight. This application shows that airground integration technology can provide support for test point accessibility analysis, test point optimization configuration analysis and reduce the burden of flight test monitoring in flight.