Abstract: Towed bird helicopter-borne frequency domain electromagnetic and magnetic synthetic system (hereafter towed bird system) with new broadband technology, high digitized degree and flexible system is very suitable for mineral, hydrological, engineering, environmental exploration in complex terrain, but it′s hard to work in complicated mountainous regions, and we didn′t have practical experience. Basing on trial-produce in three survey regions, we acquired outstanding achievements in survey method and technique, data processing, data interpretation, basic geological research, mineral exploration, and underground coal fire exploration. It worked out the problem of feature of electrical property in coal fire area, and the key problem of searching conductive ore body directly with aero electromagnetic method. It remedied the weaknesses in searching polymetallic ore body with aero-magnetic method indirectly, and had brought very good prospecting effects.