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To solve the problem of the GPS technique limitation of USA such as positioning accuracy and quick positioning, and potential danger in national defense, Beidou system in flight test was studied based on the developing capacity of Beidou system in national defense. The application of the message communication technology、point positioning、post difference and real time difference of Beidou system in flight test were introduced, and method of process Beidou Position data was discussed. The article compared the data of Beidou with GPS data in flight test, the result showed that the accuracy of Beidou data could be comparable with that of GPS; finally the application prospect of Beidou in military and commercial field were discussed.