Based on basic geological data, this paper summed up the characteristics and metallogenesis of the magmatic-hydrothermal transition in the Jiama（Gyama） monzonite granite-porphyry with the help of the electron microprobe analytical data and rock geochemical data in the aspects of petrology, petrography and geochemistry. The characteristics of the magmatic-hydrothermal transition in the Jiama（Gyama） monzonite granite-porphyry is manifested as tourmalinization-sodium/calcium silicate, like pegmatite-aplite shell （pulse）, “adularia-habit”  K-feldspar crystals, myrmekite, miarolitic cavities, while the geochemical characteristics are expressed as the growth and decrease of Na/K and the fluctuatation of the volatiles with the separation of the ore-forming materials such as Cu, Mo, Au.