Abstract: The study of S and Pb isotopic data for the bearing-copper porphyries and metals in Jiama copper polymetallic deposit，show that the S isotope and Pb isotope compositions from ore minerals are similar to those from porphyries，and vary slightly. The sulfur isotope fractionation in the ore fluid almost reaches the equilibrium，showing the typical signature of mantle S. The uniform Pb isotope compositions for the deposit imply that the Pb isotopes may have the same origin and similar developing history. The Pb isotopes are plotted mostly between the mantle and orogenic belt evolution curves in the plumbotectonic framework diagram. The ore-forming materials in Jiama copper polymetallic deposit were mainly from magma. The ore-forming porphyry was formed due to upper-crust under the orogene，and the input of enriched mantle components.

Key words: Sulfur isotope, Lead isotope, Copper polymetallic deposit, Tibet Jiama