This paper made a systemic study of isotopic and element geochemical characteristics of the ore-bearing porphyry, wall rocks, ores, pyrites in the ore and mineralized wall rocks in the Jinduicheng Mo deposit, with a discussion on the origin of the ore-forming materials. The results indicate that the Jinduicheng ore-bearing porphyry is enriched with light rare earth elements (LREE) and has obvious fractionation between LREE and HREE as well as indistinct or no negative Eu anomalies (δEu=0.70~0.96). Four pyrite samples are enriched with LREE and have slightly negative Eu and no Ce (δEu=0.64~0.81, δCe=0.88~1.03) anomalies.