Duobaoshan area,located in Duobaoshan-Aershan copper(molybdenum) metallogenic belt in the central and northern part of the Greater Khingan Mountains，is an important porphyry copper ore source area in North China.The 1∶50 000 stream sediment survey was carried out in the study area,analyzing 11 elements in 1 391 samples.By analyzing geochemical parameters and element assemblage characteristics,162 single anomaly elements and 18 assemblage anomaly elements were delineated,and Au，Ag，Cu and Mo were determined to be the major ore-forming elements.According to the geological conditions for mineralization as well as characteristics of anomalies,the study area was pided into Duobaoshan-Tongshan copper and molybdenum metallogenic prospective area，Zhengguang gold metallogenic prospective area and Genli River molybdenum and tungsten metallogenic prospective area.