Abstract: Dahongshan mine district is situated in the south-west end of Sichuan-Yunnan SN-tectonic belt. Na-rich basic volcanic-sedimentary metamorphic formation of Dahongshan group of Proterozoic era is discordantly covered by the "red bed" of Mesozoic era. The orebodies, occurring in vicinity of the volcano, are devided into three groups: volcanic exhalation hydrothermal sedimentary-metamorphic Fe-bearing copper orebodies, subvolcanic hydrothermal veined copper orebodies and reformative veined copper-polymetallic orebodies. The former occurs in the transitional belt from volcanic rocks to sedimentary rocks; While the latter occurs in the rift of the basement and cover rocks. The zoning of the deposit is clear, from the stratified ore to the reformed veined ore and veined ore from bottom to top, element constituent change from Cu,Fe(Co,Au) to Cu,Zn(Au,Ag) to Zn,Pb(Cu,Ag). The minerogenetic process involves three stages, namely, hydrothermal sedimentation, regional metamorphism and reformation after the metamorphism. The ore-forming metals of the veined ore in cover beds derives from the stratified ore and the ore-bearing volcanic formation in basement. The ore-veins in cover beds are the marks to the blind orebodies in basement.