Using the passive-source seismic data collected during November 2009 to March 2011 from a multidisciplinary transect in the mid-lower Yangtze metallogenic belt, the authors perfomed studies of receiver function imaging and others, and achieved seismic images of the crust and upper mantle structures in the study region with great clearance. Based on the images obtained from the receiver function studies, the authors suggest that the lower crust of the Yangtze metallogenic belt to be one site of the multilevel metallogenic magma system, and the formation of the metallogenic belt to be a result of MASH process. Then adakitic-like magma rised up along the extensional and the decollemental structures in the shallow crust as intrusive bodies, and reacted with country rocks to form mineral deposits.