Abstract: The division of metallogenic belts in Sino-Mongolian border area has recently been one of the most important issues aimed at studying the metallogenic regularity. Based on the theories of plate tectonics-geodynamics and the results of informational structural map and minerogenetic map (1:1000000) which were completed by experts from Mongolia and China, this paper firstly provides a unified division of the metallogenic belts in this area. The metallogenic domains of grade I belong to the Paleo-Asian and the Marginal Pacific Metallogenic Domains in this area. The Paleo-Asian metallogenic domain includes 3 metallogenic provinces comprising Altay, Junggar-Southern Mongolia and Tarim metallogenic provinces, 12 metallogenic belts and 21 sub-metallogenic belts, whereas the Marginal Pacific Metallogenic Domain includes 2 metallogenic provinces, 4 metallogenic belts and 15 sub-metallo-genic belts. In addition, this paper suggests that the western part of the sub-metallogenic belt of Oyu Tolgai-Chagan Subuerga largesuperlarge porphyry deposits in Mongolia is connected with the sub-metallogenic belt of the Chinese East Tianshan-Beishan submetallogenic belt, and this understanding provides the prospecting direction in search for porphyry deposits in this area.