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Aiming at the requirement of real-time monitoring and the urgent need for the rapid acquisition of results during the flight test of C919, in view of the characteristics of high flow and high rate of today's airborne network data packets , on the analysis of traditional application patterns and system structures ,the shortcomings of the traditional airborne real-time data processing system in function and performance are pointed out and a new design method of airborne real-time data processing system based on embedded structure, real-time monitoring to process complex functions quickly is put forward. Compared with the system based on IPC, embedded structure and real-time operation system can greatly improve the system's multitask real-time data processing capability.At the same time, the online processing of important parameters and the storage of result data are added in the system, which makes the test engineer get the result data after the task immediately , so as to solve the problem of long waiting time for ground data processing. The practice shows that the new system meets the requirements of the C919’s test, and can significantly accelerate the flight test decision and improve the efficiency of the flight test. This method provides a reference for the design of other airborne real-time data processing systems.