Abstract: In July 2009,in Harbin Pingfang airport.The research group of "Research and Development of the Digital Vector Aeromag?netic Exploration System" carried out a series of experiments using the model machine of tri?axial aeromagnetic gradiometer exploration system,which includes the modification of aircraft,compensation flight and exploration flight of 5 000 km.All of the work achieved good results and showed that the system was stable,reliable and reached practical level.The experimental work provides the basis for the im?provement and perfection of the system.