Petrological,geochemical and Nd,Sr,Pb isotopic studies indicate that the ore-hosting volcanic rocks of Xiongcun supperlarge copper-gold deposit in the Gangdese copper belt, Tibet belong to dacite porphyry with ultro-shallow emplacement.Their SiO2 contents vary in a narrow range of 61.97% to 64.31% and Na2O is high relative to low K2O with a mean Na2O/K2O ratio of 5.25.Geochemically they are notably rich in large-ion incompatibale elements(LILE) Rb, Ba, K, Sr, Pb. Meanwhile their high field strength elements(HFSE)are in depletion state.Sr and Nd isotopic compositons yield a small variation range(87Sr/86Sr=0.705154~0.708267, ISr=0.704299~0.705357;143Nd/144Nd=0.51273~0.512931). Further study indicates that they were arc volcanics originated from subduction of Yalozangpo oceanic crust beneath the Euroasian continent.The magma source had EM1-type primary mantle richment,and some subducted sediments were involved in partial melting of the mantle source.Based on the ore-forming age and mineralization characteristics of the deposit, the paper points out that the genetic type of the deposit is the same as that of the Jiaojia-type gold deposit of Shandong and belongs to fracture-controlled altered rock type.