In order to meet the demand of largescale detailed magnetic survey in geological mapping and mineral exploration, the authors, with the dynamic delta-winged aerobat as the carrier and on the basis of the integration of the present advanced software and hardware technologies, designed and developed the MAMSS-1 type minimum altitude highprecision aeromagnetic system. After the successful trial flight, low altitude aeromagnetic survey with the linespacing of 100 m was performed over a known ore district. The result is very close to the result of the medium-scale ground magnetic survey. It is thus concluded that this system can be used as an effective rapid appraisal means in place of large-scale and mediumscale ground magnetic survey.