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In cross-generation upgrade of the avionics system of aviation products, the detection and analysis of the AFDX bus data is an important technology medium for scientific research appraisal to the avionics system of aviation products in the flight test, in view of the characteristics of the AFDX bus data acquisition and recording of complex airborne electronic environment, the bus data is random and so on, designed the detection and analysis technology of AFDX bus message recognized, frame analysis, lost packet analysis, and the AFDX bus cycle detection algorithm is used in combination, design the detection and analysis technology of the AFDX bus, realize the detection and analysis of the flight test AFDX bus. In the end, the technology is carried out in the flight test of a test aircraft, which meets the detection and analysis requirements of flight test AFDX bus data.