Avionics system for modern civil aircraft is complicated and the amount of flight test project and sorties are very heavy, however the flight test efficiency is low and usually has to conduct too many sorties. This paper deeply researches marker beacon (MB) system and the flight test methods given by FAA Advisory Circular (AC).A new combine flight test was presented, which got data from normal landing for MB system consistence analysis.Compared to single MB, not only got more data,but also reduced flight sorties, and flight test efficiency was improved.