Abstract: Tuwu largest type porphyry copper deposit is located in the island arc environment in the south margin of Turpan-Hami continental segment of eastern Tianshan Mountain. Many stages of magmatism and mineralization are the main reason of the copper metal unusual accumulation, the volcanic activity and hot spring which boils and spreads in the sea bottom make the copper metal preceding concentration (source bed), and the enplacement and superimposition mineralization of dioriteporphyrite and plagiclases-granitic porphyry in the some space makes the copper metal accumulate further and forms the deposit finally. The volcanic rock which is composed of spilite kera tophyre mainly erupted in tidal flat-littoral environment. The diorite-porphyrite and plagicla ses-granitic porphyry are formed in the shallow place of the earth crust. The mineralization occurs in the strong oxidation environment,so the pyrite which is the indicator mineral of the high reduction environment is little.