Geza island arc located in the southern of Yidun arc of southwest Sanjiang tectonic igneous rock belts in China, it was the result that GanziLitang oceanic crust dived to the Zhongdian Landmasses in late Triassic. The belt is an important discovered copperpolymetallic metallogenic belt in the recent years in China. The regional strong tectonicmagmatic activity runs through the orogenesis of island arc, the rich mineralization developed in the different times and different circumstances of island arc orogenesis, where outputed the large sized Pulang and Xuejiping porphyryrelated copper polymetallic deposit. The Pulang porphyry copper deposits is a typical representative of Indosinian porphyry copper deposits, the orebearing porphyry SiO2 content in 60.07%～65.78%, it belongs to the neutralacid rocks. Al2O3 content is 14.80%～15.97%, (K2O+Na2O) is 5.79%～10.99%, K2O/Na2O is 0.7～1.14, Rittmann index (σ) is 1.02～1.9, Consolidation index (SI) is in the range of 7.65～24.77, Differentiation index (DI) is in the range of 61.17～70.58, so the rocks belong to calcalkaline rocks series and have the better magma differentiation. A/CNK values in 0.74～0.981, average of 0.87, rocks belong to prospective aluminous granits. Zircon UPb dating results show that the quartz diorite formation age was 220.8±4.1Ma, the quartz monzonite porphyry formation age was 214.8±3.5Ma， porphyries rocks metallogenic epoch is mainly concentrated in the Indosinian.