The Wenquan porphyry molybdenum deposit in West Qinling area occurs in Indosinian complexes, with the wall rocks being K-rich calc-alkaline rocks. CIPW calculation shows that they are of the normal type, and in Q-A-P diagram they are all plotted in the adamellite region. Trace element analyses show that Mo, Cu, Ag, As and Bi were closely related to mineralization, and REE geochemical studies reveal that the rocks are characterized by enrichment of LREE, good fractionation and strong Eu depletion. It is thus concluded that the rocks were products of crsut-mantle magmatic mixture and provided ore-forming materials.