Abstract: The Zigangping Pb-Zn deposit lies on the southeastern margin of the Songpan-Garze orogenic belt and western Yangtze block.The orebodies are layered and lenticular in the interlayer fault zone between the garnet-bearing plagioclase biotite quartz schist and garnet-bearing paragonite schist intercalated with quartz schist.The ore minerals are mainly sphalerite, galena and pyrrhotite.The δ³⁴S analysis was carried out on ore-related sulfides from galena, pyrrhotite and sphalerite.The δ³⁴S values mainly vary between 10.67‰ and 18.17‰ (averaging 14.79‰), and are characterized by enrichment of heavy sulfur and mixed sulfur.The S isotopic data indicate that the sulfur may have experienced thermochemical sulfate reduction, with the characteristics of formation water and deep thermal fluids.