Abstract: The Liujiushan Cu-Ag deposit in Heilongjiang Province, located in the middle-eastern Daxinganling metallogenic belt, is an epithermal vein deposit. The deposit is distributed within explosive breccia zone, with a width of 500 m and a length of 1200 m. The ore belt occurs in the Late Jurassic granodiorite and the volcanic rocks of Baiyingaolao formation, which consist with the breccia zone. Totally 24 ore bodies are identified in the deposit, of which 19 are commercially significant. The ore bodies are in irregular veins and lens, with a strike of 61° and dip angle of 20°-35°. The lengths of single orebodies are not longer than 780 m, usually around 300 m, with an average thickness of 7.18 m. The Cu grade of ore bodies ranges from 0.59% to 1.01%, with associated Ag of 3×10^-6 to 5×10^-6. The average Cu grade in the deposit is 0.73%, with Ag of 5.87×10^-6. Intense volcanic-magmatic intrusions took place in the Liujiushan area, with 9 central type volcanoes distributed in the 20 km² area. The Liujiushan Cu-Ag deposit is closely related to the Mesozoic volcanic-magmatic activities. The formation of the deposit experienced three stages, i.e. 1) ore-forming material deposition in Early Permian; 2) mineral preliminary enrichment in Late Jurassic and 3)mineralization in Early Cretaceous.