In the 1:1 000 000 high precision aeromagnetic reconnaissance performed in central and western Qinghai Tibet plateau, the acquirement of high quality surveying result depends largely on keeping relatively low flying altitude in field work. With the prerequisite that the flying safety is guaranteed, this paper puts forward a new surveying method aiming at effectively lowering the flying altitude in accordance with the topographic and meteorological conditions of the surveyed area and the performance of the aircraft. Practice shows that this method can yield satisfactory result and hence deserves popularization.