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Airworthiness certification is a key link in the development of large aircraft. Flight test is an important basis for the implementation of airworthiness certification tasks. Throughout the flight test of large aircraft at home and abroad, real-time processing of airborne data is very important. The real-time processing system of airborne data is studied in C919. Based on VXWORKS embedded real-time operating system, the performance of C919 airborne data real-time processing system is improved by integrating the function modules of the existing airborne real-time processing system and optimizing the software design. Flight validation shows that the system can receive, store, process, forward and process the 110 MB/S network data in real time. Compared with the traditional design, it can better ensure the real-time processing of system data, and provide technical support for ensuring the safety of large aircraft flight test and improving the efficiency of flight test.