On the basis of geological survey and petrographic(ore microscopy) and through the comparison and analysis of geochemical characteristics of the metasomatic alterated rocks of the Zijinshan gold-copper deposit, we have further understanding on the high sulfidation epithermal hydrothermal metallogenic system of the Zijinshan gold-copper deposit. Compared with other kinds of metasomatic alterated rocks, geochemical characteristics of alunite metasomatic alterated rock are mainly reflected in: ①Al2O3 and K2O in the main elements increase significantly, and SiO2 reduces significantly, and the other rock-forming elements also have a reduced trend; ②The analysis of the metallogenic elements shows that there is a close correlation between copper, sulfur and fluorine. The metallogenic element has a weak positive correlation with Au and Ag, and has poor correlation with Pb, Zn, Sn, etc.; ③Trace elements show the contents of large ion lithophile elements are higher in the fluid, which is significantly rich in Rb, Ba, Th, U and Pb significantly and poor in P, Ti; ④Rare earth elements generally have high light rare earths, low heavy rare earths and a slight negative Eu anomaly or without obvious negative Eu anomaly. Geochemical characteristics of alunite metasomatic alterated rock show that the high sulfidation epithermal hydrothermal ore-forming solution of the Zijinshan gold-copper deposit is a kind of fluids rich in multiple ore elements of copper, gold, silver, etc., and ore-forming elements of sulfur, fluorine, etc., which formed from the long-term water-rock interaction of the magmatic hydrothermal solution related to the intermediate-acid volcanic-intrusive complex of late Yanshan period and the granitoids of early Yanshan Period.