By means of microscopy and laser Raman spectroscopy，the authors studied the fluid inclusions in petrography． The results show that there exist three-phase CO2-bearing and two-phase aqueous inclusions in gold ore; the fluid of NaCl--H2O--CO2 system went through immiscibility in ore-forming process． Ore-forming fluids were of low salinity ( 0. 82%--5. 40% NaCleqv) ，low density ( 0. 54-0. 93 g /cm3 ) ; mineralization temperature were concentrated in 320℃--340℃，with ore-forming pressure in 62-126 MPa and mineralization depth in 6. 34-9. 35 km． The fluid inclusions in quartz are generally characterized by a small amount of CO2 and N2 ． Combined with recent results of the isotopic analysis for fluid inclusions and dating data，it was indicated that the main ore-forming fluids derived mainly from source of mantle-derived fluids with a small amount of magmatic fluid and meteoric water． The genetic type was mesothermal gold deposits involved by mantle-derived fluids．