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Put forward method of flight signal reproduction based on bus instrument, being used for the facticity and effectiveness of function and performance test of flight data recorder. By decoding, elimination of abnormal value, data interpolation and smoothing and anti-decoding of the original flight data, the test instrument was driven to produce signals according to certain time sequence. The signals used as data sources of flight data recorder in ground station. The researched flight signal management system (FSMS)，which included analog, discrete and bus signals, realizes flight signal reproduction and self-checking, ensuring the accuracy of flight signal reproduction. The FSMS included hardware platform and system software. Hardware platform composition and system software architecture were introduced and the key technology of design and implementation were described, such as network integration, centralized interconnection interface, clock synchronization and triggering, hardware resource modeling, flight data decoding, elimination of abnormal value, data interpolation and smoothing, IVI class package, etc. Through on-line test of the system and the flight data recorder of a certain model, the developed function and performance of both software and hardware and accuracy of flight signal reproduction are proved.