The Sinongduo Pb-Zn deposit is located in the Gangdese porphyry copper ore belt. The formation of the ore deposit is divided into three periods. The first period was the Middle Carboniferous at which Sedex bed was formed contemporarily with carbonate rocks as the source bed. The second period was the tectonic mineralization period which was further divided into two mineralization phases. The third period is mainly supergene mineralization, i.e., dilution of the primary sulfide ore body caused by oxidation and removal of Pb, Zn oxides. The anomaly areas in south and north of the deposit are potential for further exploration.