Abstract: The Songjiang Cu-W-Zn polymaetallic deposit, early discovered and exploited in Northeast China, has already become a crisis mine for lasting exploitation. Comprehensive analysis on regional geological background, deposit characteristics, and especially the associated rocks’ geochemical characteristic analysis indicate that the deposit belongs to the contact metasomatisc deposit, and the granodiorite colsely associated with the mineralization is the typical product of island arc or active continental margin tectonic setting. The chondrite-normalized REE patterns of the granodiorite, skarn and marble show a great commparability. Moreover, the W and Mo elements mainly originated from the granodiorite, and the Pb element mainly came from the carbonate. While the Cu, Zn elements might originate from both, and the Cu element tend to come from the latter more, the Zn element from the former more. These conclusions can explain the obvious mineral zonation from the granodiorite to carbonate：Mo-W, Fe-Cu, Cu-Pb-Zn and Pb-Zn in Songjiang polymetallic deposit.