Abstract: The Liwu copper orefield in Jiulong, Sichuan tectonically lies in the Jianglang metamorphic core complexes. The detailed examination has been made for the origins of the ore-forming matter from the Liwu copper orefield on the basis of hydrogen, oxygen and sulfur isotopes, trace elements and geological background. The origins of the ore-forming matter are believed to be associated with the intrusion of the Yanshanian "S"-type granites. The magmatic hydrothermal fluids with the ore-forming matter migrated upwards along the pathways due to the thermal effect during the magmatic intrusion. Meanwhile, the repeated reaction between the magmatic hydrothermal fluids and wall rocks once occurred and resulted in the formation of the multicomponent hydrothermal systems.