For the purpose of proper utilization of aero geophysical survey method in the Tibetan Plateau, which is characterized by high altitude, large scale and low flying height, the authors selected a suitable type of helicopter, and carried out some tentative ground and air researches on the selected helicopter's magnetic interferences form, frequency, amplitude, attenuation regularity and, on such a basis, designed a long firm anti-vibration survey system suitable for AS350-B3 helicopter. The experimental results indicate that magnetic interference in a geophysical aircraft environment comes from several sources, which include 700 nT/96 s pulse and 300 nT/s square wave magnetic interference as well as 20 nT/s from rate of change of movement of conductive surfaces with rotary wing. Through low flying height and high quality data survey in central and south Qilian of Qinghai Province, the authors prove that AS350-B3 helicopter and a long firm anti-vibration survey system can be used for a large scale, low flying height aero geophysical survey in the Tibetan Plateau.