In this article, writers studied the ages of the non ore and ore bearing two types of quartz diorite porphyry in the Disuga porphyries of the central Geza island arc with zircon LA ICP MS U Pb dating method. We got the formation age of the non ore quartz diorite porphyry（DSG 1） was 203.03±0.54 Ma，the age of the ore bearing porphyry（DSG 2） was divided into two groups 217.25±0.89 Ma and 208.5±1.0Ma，so the magmatic intrusion time was restricted to 217～203Ma. However， the hydrothermal events associated with mineralization mainly occurred in 208Ma. The Disuga quartz dioritic porphyrite has a geochemical affinity of arc magmas，Na riched（Na2O/K2O=0.91～2.91，average of 1.65），metaluminous（A/CNK=0.848～1.244，average of 0.996)，enriched in LREE（LaN/YbN=9.44～26.09）and LILEs (K、Rb、Ba、Sr） and incompatible elements （U，Th and Pb），depleted in high field strength elements (HFSE，Nb、Hf、P、Ti). The Studies have shown that the time of genetic and metallogenic occurred in the Late Triassic，magmatism and mineralization are basically consistent，the geochronological，geochemical characteristics of the Disuga porphyry，combined with tectonic evolution，suggests that it was formed in magmatic arc setting，implying that its formation is probably related to the subduction of oceanic crust in Indosinian. But the time of the magmatism is close to the Yanshanian， which explains the existence of magmatism in Geza arc in the early Yanshanian and has the very important significance of investigating on the evolution of arc magmatic and diagenetic mineralization.