Based on the results of the newly-completed 1:50 000 high-precision aeromagnetic survey in northern Derbur of Inner Mongolia, the authors made a relatively detailed division of fault structures and lithologic characters in the northern part of the Derbur metallogenic belt, added or revised lots of geological data, and conducted an analysis and interpretation of newly-inferred fault structures and newly-delineated lithologic units, thus obtaining much new knowledge. It is pointed out that there exist close relationships between magmatic, altered and metamorphic rocks and Au, Ag, Cu, Pb and Zn polymetallic deposits, and that the newest aeromagnetic data obtained from the high-precision aeromagnetic detailed investigation in northern Derbur seem to be very useful in the delineation of fault structures, intrusive bodies and altered zones.