Aircraft is a large complex system, and the development of aircraft system requires several rounds of iteration.The simulation technology plays an irreplaceable role in the process. FlightGear, an open source simulation software, is used for flight simulation. However, it cannot be directly used in aircraft system research and development of simulation and verification. A set of software system combined flight data management and analysis is presented based on FlightGear. In order to collect real-time flight parameters flexibly and store them in database, the system expands and develops storage and communication modules for data collection, thus making the full use of the interfaces of FlightGear. The system designs and implements analys is module for predicting attitude of aircraft, and improves the prediction accuracy of posture parameters. At present, the extended system has been applied in research and demonstration of aircraft system and has achieved good economic benefits.