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The flutter test is an important topic in flight test. The real-time online display of the flutter parameters is the most important part of the on-line calibration of the flutter parameters.Based on this.an on-line real-time monitoring method based on IRIG standard is proposed.Firstly,the standard of IRIG recording of flight data is studied,and the recording format of the flutter parameters is introduced. Then the BCB interface design and Matlab data analysis of mixed programming are studied,using the combination of programming and multi thread combination,completed the network data extraction,data packet capture,channel data acquisition display and display FFT. The accuracy and feasibility of the software are verified by on-line real-time monitoring of the standard signal,and the requirement of the flutter parameters calibration is met.