Abstract:Controlled by divers complicated factors, largesized AuAg deposits or their concentrated areas are mainly controlled by the types of volcanic basin s and their configuration, tectonic settings, basement faulting, volcanic facies, por ph yry, and basement oresource bed. For an overlaid volcanic basin, the orig in al basement oresource bed and the magma derived from mantle and comelting th e old basement are the main orecontrolling factors. As for an inherited basin, the development of volcanism and succession of volcanosedimentary formation domina t e the metallogenesis. Ore deposits are generally located at the transitional sec ti on o f two different tectonic units, and are related either to a rift or an island fo rmation. The types, chemical composition, configuration and attitude of porphyries are decis i ve for the location and distribution of ore deposits in space, time and origin. AuA g deposits are generally formed at the transitional section from volcanic rocks to s edimentary rocks, representing the transition from intensive volcanism to vo lcanic tranquility. The "threelevel" structures, i.e. deepseated basement f aulting, over burden faulting and subsurficial faulting, are conducive to metallogenesis. From the volcanic apparatus downwards,there are multiple orehosting fissure sy stems: the top fissure system in porphyries, the f i ssure system in breccia pipes and th fissure system in caldera. Th e cons iderable extension of breccia pipes, existence of more than one fluid system an d compl etion of fluid feeding and fluid drainage systems are decisive factors for the f ormation of ore deposits.