Abstract: Aershan area is located on Fe-polymetallic mineralization belt of southern Mongolia-Dong Ujimqin Banner-Aershanon China-Mongolia border，which prospecting potential is huge.However，due to the low level of geological exploration and the forested area of Great Khingan， the prospecting has not made great progress for a long time.Combined with the 1∶50 000 ore survey working results of the area，the polymetallic iron deposits in the area is divided into three types according to their genetic types. The skarn type and sedimentary metamorphic type iron polymetallic deposits with great economic value are emphatically analyzed，besides that，the comparative study with the typical ore deposits in Southern Mongolia and Dongwuqi Area of Inner Mongolia， China is done.The results show that:The skarn type iron polymetallic deposits in the Southern Mongolia-East Wuqi-Aershan iron polymetallic metallogenic belt are mainly controlled by the NE-trending faults and their derived sub-faults，skarn is calcium skarn related to acid magmatic rocks，the ore-bearing surrounding rock contains carbonate rock which is conducive to the mineralization of skarn deposit，the surrounding rock alteration mainly includes skarn， silication， carbonation and epidotization.The sedimentary metamorphic iron polymetallic deposits in the iron polymetallic metallogenic belt are mainly controlled by NE-trending folds，all of them are BIF type iron ores related to large scale early Yanshanian acid intrusive rocks，all of them have the characteristics of metamorphic superimposed transformation of mineralization in the later stage of primitive Marine deposition，all of them are low grade ores， and the main host rocks are middle and low grade metamorphic rocks such as SLATE， schist and phyllite.On this basis， the metallogenic geological conditions and prospecting direction of iron polymetallic deposits in the Arshan area are preliminarily summarized， and the metallogenic prospective areas of different genetic deposits are divided.With the further strengthening of geological exploration，it is expected to find large skarn type iron polymetallic ore， large and medium-sized sedimentary metamorphic iron polymetallic ore and small and medium-sized hydrothermal vein type iron polymetallic ore in the area.

Key words: Fe-polymetallic deposits, genetic type, metallogenic geological condition, prospecting direction, skarn type, sedimentary metamorphic type, Aershan area