Miocene adakite porphyries are widely distributed along the southern margin of the Lhasa terrane, but they exhibit significant variations in ore- forming element composition and mineralization scale. In order to better understand the constraints of different mineralization of these Miocene porphyries, this study focuses on the ore- bearing porphyries of the Jiama Cu deposit and Bangpu Mo deposit. We carry out TIMA scanning and electron probe analyses of single melt inclusions in quartz phenocrysts from these porphyries. The results show that the melt inclusions in both Jiama and Bangpu are predominantly crystalline,composed mainly of quartz, albite, orthoclase, plagioclase, and mica. A significant negative correlation between SiO2 and K2O is observed in these melt inclusions from both deposits, classifying them as high- K calc- alkaline to shoshonite series. The Jiama ore- bearing porphyry has lower Cl (0~0. 03%) and higher H2O (1. 12%~4. 35%) contents compared to the Bangpu porphyry. Previous research has shown that the injection of ultrapotassic magma and strong crystallization differentiation of potassium feldspar play an important role in the formation of porphyry deposits in collisional environments. In addition, the content of volatiles (including H2O and Cl) significantly influences the differences in metallogenesis.