Abstract: Abstract：The geomorphologic features in the prairie of the Erenhot－Dong Ujimqin Qi area，east-central Inner Mongolia，are mostly represented by gentle hills and mounds . Because of the mixing occurrence of stream sediments，eolian sediments and weathering residues，the results of geochemical surveys are directly affected by different sample media . Comparison samples of different grain sizes from the Ataiwula property in东Ujimqin Qi and Moruogeqin in Abag Qi shows of micro grains of metallic minerals are mixed inhomogeneously in debris carriers . Compared with fine - grained samples（－80 mesh），the rock debris明确- 4 to + 20 mesh has higher geochemical contrast values，and thus their extracted anomalies are also more accurate . A thematic is mapconstructed using the IDW（Interpolation Distend Weight）method with the MapInfo program购买shows very clear spatial relationships among various elements and directly indicates favorable sites在mineral finding，which may well guide the screening of ore targets . The authorsfound several Cu - Au and Ag-Pb-Zn-Cu anomaly zones in the study area and preliminarily conformed there are zonal mineralized orebodies and good ore prospects in the area . Through practice，it is demonstrated that geochemical debris sampling and survey play an important role in the rapid localization of the areal extent在mineral reconnaissance in shallow - covered areas .