Abstract: Based on studying in mineralization geological features and geochemistry characteristic in Sijiaoy ang Pb-Zn polymetallic deposit located at Qimantage back-arc rift structure zone belt,it is described that the ore is limited in the localization area of the outsides contact zone between magmatic rock and marble and another fissures,and it like layered or lens,and characteristics of Traceelement and REE show that the causes of type is skarn polymetallic deposits.Sijiaoyang ore prospecting work should be carry out the areas,where occur the carbonate,Indosinian alkaline granite and 1:5 million magnetic anomaly.