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ARINC 818 avionics diitgital video bus has been used more and modern aircraft because of high bandwith and low delay.Due to the limitation of telemetry transmission bandwith,it is impossible to the video bus signal to the ground for real-time monitoring without damage during flight test.Based on the analysis of video signal ,this paper puts forward a method to realize the simultaneous transmission of multiple picture through format transformation ,video compression and TS packet ,and introduces its engineering implementation process in detail.Test flight vertification shows that the test, method is correct,reasonable and feasible in engineering,transmission picture quality is clear and smooth,link delay meets the requirements of real_time monitoring.