The late Yanshanian Laba porphyritic granite, associated with a superlarge Mo(-Cu)-polymetallic deposit, was recently identified by drilling exploration in Shangrila area of northwestern Yunnan Province. The magmatic biotites and amphiboles have recorded the detailed petrogenesis information including the temperature, pressure, oxygen fugacity, and the source origin of the parent magma. The authors investigated the mineralogical composition of the biotites and amphiboles in the porphyritic granite from the Laba Mo(-Cu) deposit, and constrained the physico-chemical conditions of the ore-bearing magmatic rocks as well as the metallogenic potential. Electron microprobe analyses (EMPA) show that the biotites have uniform Fe²⁺/(Fe²⁺+Mg) values, without or with minor CaO, and the Ti cation number is 0.31~0.52, indicating that they are of magmatic origin. The Si, Ti cation num-bers of the amphiboles are 6.68~7.20 and 0.09~0.13 respectively, indicating that they are also of magmatic origin. The authors have reached the conclusion that the formation temperature, pressure and depth of the porphyritic granite are 705~903℃, 59~449 MPa and 2.2~17.0 km respectively. The features of mineral geochemistry of the biotites and amphiboles suggest that the porphyritic granite belongs to the I-type granite with the addition of mantle-derived materials, and was formed in an environment with high oxygen fugacity. The values of F and Cl in the biotites are 0.17%~0.58%, showing that the fluids exsolved from the granitic magmas were rich in F and Cl, which was beneficial for enrichment and mineralization of Mo and Cu. These results shed light on the correlation between the rock-forming and ore-forming processes for the superlarge Laba Mo(-Cu)-polymetallic deposit. Meanwhile, they also indicate that the Laba orefield has a giant potential for future exploration.