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Real-time monitoring function of flight data recording system is designed to focus on the problem that being slow to locate the fault and lack of ways for detection in integration tests during flight platform development. Airborne equipment and ground equipment of flight data recording system exchange data through Ethernet, which realize real-time monitoring of aircraft condition.The effect and advantage of real-time monitoring function is analyzed. The hardware configuration and software architecture of airborne equipment is expounded which is based on the need of real-time monitoring function. A communication strategy between airborne equipment and ground equipment is proposed using UDP communication protocol. The period of data communication is controlled by ground equipment in the strategy and the flight data collected by airborne equipment is sent to ground equipment periodically, which can make flight data record and observe at the same time. The application of the strategy indicated that the function of flight data recording system enrich methods to test, improve the efficiency of each system test and realize real-time monitoring of aircraft condition. The method lay the foundation for rapid detection technology before flying and have the actual application value.