In this paper, based on the new understanding of tectonic evolution of Inner Mongolia, the new progresses in geosciences of its adjacent areas, especially a large number of precise mineralization ages data, and the new understanding of the sources of rock-forming and ore-forming materials, the authors divided the ore deposits in Inner Mongolia into 11 metallogenic series: 1) the Archaean Anshan type metamorphic sedimentary iron deposit metallogenic series(consisting of the Middle Archaean and the Late Archaean series); 2) the Middle Proterozoic submarine exhalative type lead-zinc-copper-sulfur deposit metallogenic series; 3) the Mesoproterozoic Bayan Obo REE-Fe-Nb deposit metallogenic series; 4) the Ordovician-Silurian porphyry copper deposit metallogenic series; 5) the Devonian ophiolite related chromite deposit metallogenic series; 6) the Late Permian-Triassic granite related molybdenum-gold polymetallic deposit metallogenic series; 7) the Triassic-Middle Jurassic porphyry copper deposit metallogenic series; 8) the late Jurassic-Early Cretaceous granite related epithermal type lead-zinc polymetallic deposit metallogenic series in De’ erbugan area; 9) the late Jurassic-Early Cretaceous granite related lead-zinc-tin-molybdenum-gold polymetallic deposit metallogenic series in the Da Hinggan Mountains and adjacent areas; and 10) the Cenozoic lacustrine sedimentary-evaporation related salt deposit metallogenic series.