he most prominent advantage of the heavy magnetic information is its deep penetrability, which can detect deep geological and structural characteristics. Therefore, the method has been widely used in basic geological research and resource evaluation as well as in the investigation of basement undulation below the thick cover layer and the deduction of deep structures and geological bodies (including invaded bodies and mineralized bodies). The key of the application of the heavy magnetic information lies in setting up a set of standards to deduce the possible material composition, size and burial depth of the geological body as well as its relationship with mineralization. Based on the data of the Nannihu molybdenum mine in East Qinling Mountains, the authors tried to deduce the mineralization possibility in the same geological-structural unit. The combination of geophysical and geochemical information led to the discovery of a new molybdenum polymetallic deposit.