The Xingyuanchong copper deposit of Huangmao area is located in the west segment of the South Jiuling large copper polymetallic ore concentration area. In combination with the metallogenic characteristics of the ore deposit, the authors mainly studied stable isotopes of the ores to probe into the sources of metallogenic materials and metallogenic mechanism of the deposit. In combination with isotopic data and geological setting, it is proposed that the ore-forming processes of the Xingyuanchong copper deposit could be divided into two stages. At the first stage, submarine volcanic sediments or protore layers were formed in Mesoproterozoic. At the second stage, the pre-existing protores were altered by the hydrothermal fluids and dynamic metamorphism mainly derived from Jinning orogenic period in Late Proterozoic.