The Zhongdian porphyry copper polymetallic metallogenic belt in northwestern Yunnan is an important copper resource base in China. Pushang is a newly discovered porphyry copper spot in the metallogenic belt. The ore-bearing composite rock mass is mainly composed of quartz diorite porphyrite and quartz monzonite porphyry. In order to explore the genesis, tectonic setting, material migration process and metallogenic potential of the rock mass, this paper studies the petrochemistry and alteration component characteristics of fresh quartz diorite porphyrite and altered quartz diorite porphyrite respectively. The results show that the contents of SiO₂ (61.16%) and K₂O (4.20%) in the altered quartz diorite porphyrite are higher than those in the fresh quartz diorite porphyrite (58.24% and 3.06%, respectively), while the contents of Al₂O₃ and Na₂O are significantly lower. However, they all have the characteristics of enrichment of large ion lithophile elements (Rb, Ba, K, Sr) and depletion of high field strength elements (Zr, Nb, Ta, Ti), and have higher Ba/Nb values (75.7 and 93.2, respectively) and lower Ce/Pb values (3.16 and 5.70, respectively). It shows the characteristics of granite in typical arc environment. The (La/Sm)_N of the fresh quartz diorite porphyrite is high (average value is 8.18), and there is no obvious negative Eu anomaly. There is a positive correlation between SiO₂ and Rb, Zr/Sm ratios, indicating that it has experienced the fractional crystallization of hornblende. The ratios of Ba/Rb (<50) and Nb/La (<1) are low, the ratio of Th/La (>0.25) is relatively high, and the ratio of Rb/Sr (0.09) is between the upper mantle (0.034) and the crust (0.35), indicating that the magma source area is related to subduction, and the magma source is crust-mantle mixed source. A large number of components in the altered quartz diorite porphyrite include Fe₂O₃^T, CaO, K₂O, Th, Ta, HREE, Cu, Mo, W, Ag and other ore-forming elements, and the migrated components include Na₂O, MgO, MnO, Sr, Ba, U and LREE, indicating that the Pushang altered quartz diorite porphyrite was affected by alkaline alteration dominated by potassium metasomatism, and the ore-forming hydrothermal fluid causing mineral alteration was rich in Cu, Mo and other ore-forming metals. The hornblende phenocrysts with high Sr/Y and V/Sc ratios are widely developed in the quartz diorite porphyrite, indicating that the original magma is characterized by rich water and high oxygen fugacity. Sericitization is widely developed in altered rocks, and Cu migrates in a large amount. All samples are in the Cu-Au mineralized area in the lithochemical composition and metal mineralization exclusivity discrimination illustration. Based on the above characteristics, the Pushang quartz diorite porphyrite has the potential to form Cu-Au deposits.