Abstract: The Gaosongshan gold deposit of epithermal type is closely associated with volcanism. The ore is mainly goldbearing quartz vein and tectonic breccia-altered rock types, with sulfur compositions of deep source. The H-O isotopic compositions of fluid inclusion represent the mixture of atmospheric precipitation. The deposit is hosted in the Mesozoic Upper Cretaceous volcanic rocks, associated with dacite, andesite, andesitic porphyrite and rhyolite. The geochemical characteristics show a background of active continental margin.