Controlled by divers complicated factors, largesized AuAg 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 oresource bed. For an overlaid volcanic basin, the orig in al basement oresource bed and the magma derived from mantle and comelting th e old basement are the main orecontrolling factors. As for an inherited basin, the development of volcanism and succession of volcanosedimentary 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. AuA 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 "threelevel" structures, i.e. deepseated basement f aulting, over burden faulting and subsurficial faulting, are conducive to metallogenesis. From the volcanic apparatus downwards,there are multiple orehosting 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.