Abstract: Zuosikong Deposit is a leadzinc deposit which located in intersection part between the western wing of Yunnan “mountain” shape arc and Ailaoshan structural belt.Among them,Zuosikong Leadzinc Deposit attracts particular attention because it owes variety mineralzation types.However,the reason for the different geological characteristics has not been redefined.In addition,the comprehensive study of metallogenic series is relatively weak,and the metallogenic model is urgent to be established.Based on the regional geological background,deposit geological characteristics and mineralization regularity are studied.The resutls show that the orebodies (mineralization) are occurred in quartz vein of basement strata of Dahognshan Formation in Early Proterozoic.Besides that,the structure fracture zone between Upper Triassic and the unconformity surface of in underlying Dahongshan Formation are the favorable orebearing space.The most important factor of the ore formation are the tectonism in YanshanicanIndoChinese Epoch,and the metallogenic material are mainly derived from the Dahognshan Formation.The oreforming elements have been activated and migrated by the impel of tectonism,and the fault structure provided migration pathway and orebearing sites to mineral deficiency.