Abstract: Analysis study on the gas and liquid ingredients of mineral inclusions from the Duobuza Copper Deposit have shown that the gas phase composition of the inclusions are mainly H₂O and CO₂，on behalf of an oxidizing environment; liquid phase mainly composed of Cl^- and Na⁺，and the fluid contains a large number of halite daughter crystals with the characteristics of high salinity.Fluid is slightly acidic at hydrothermal stage.With the conduct of the mineralization process，oxygen fugacity，carbon dioxide fugacity and sulfur fugacity gradually reduced；the pH value and Eh values gradually increased.Mineralization occurs mainly in the high-temperature，high salinity，shallow，slightly acidic and oxidizing environment.

Key words: Inclusion, Gas and liquid ingredients, Duobuza copper deposit, Tibet