A H2S-and CO2-rich NaCl solution system was selected as the analogue of Yinshan ore fluids and the geochemical behaviors of Cu, pb, Zn, Ag and Au in the process of temperature lowering in the system and the ore-forming processes of the Yinshan deposit were simulated and the process with digital computer. Compared with that in the boiling system. It suggests the influence of ore fluid geochemical evolution on the migration/deposition of metals and the significance of ore fluid geochemical modelling in studies of ore genesis, ore prospecting in depth and regional metallogeny.