Abstract: In order to find out the distribution，spatial morphology and grade of the lead-zinc-silver polymetallic ore bodies in the Yinfeng-Youchuan area，the geological characteristics of the study area are studied by 1∶10，000 geological mapping，drilling engineering and sampling test analysis.The results show that a small silver-zinc deposit was found in the core of the secondary anticline of Yinshanjiao. The deposit was formed in or on the side of the silicified zone，and was shallowly buried. It exists in the Yangliugang formation of the Cambrian system，which is not only the mother rock of mineralization，but also the surrounding rock of orebody. The orebody is mainly zinc arched vein-convex mirror orebody with thickness of 1 ~ 12 m. Lead-zinc-silver is the main metal，and the average grade of Pb is 0.85%，Zn 3.04% and Ag 212.16 g/t.

Key words: silver-zinc ore, primary halo anomaly, geological characteristics, geological mapping