The Habo porphyry Cu-(Mo-Au) deposit is located in the south of Jinshajiang-Ailaoshan orogenic belt. It is a typical post-subduction porphyry deposit formed in a Tibetan post-collision transformation setting. Early quartz, quartz-chalcopyrite and quartz-molybdenite veinlets were selected to perform fluid inclusion study. The result shows that in the Habo deposit the silicate melt directly exsolved two coexisting fluid phases, a vapor and a hypersaline liquid, and the hypersaline fluid is the main carrier of metals.