The volcanic rocks of the Pana Formation in Xiongma area, Coqen county, Xizang(Tibet) are situated at Gangdis—Nianqingtangula plate, whose classification of stratigraphic region is belongs to Longger—Nanmulin stratigraphic subregion of Gangdis stratigraphic region. The rocks are mainly composed of medium acidic volcanic lava and volcaniclastic rocks, with a few tuffaceous sandstone, sandy conglomerate. The lower end of the Pana Formation is unconformable contact with the Yongzhu Formation or Laga Formation. Petrogeochemical characteristics show that the volcanic series belongs to Peraluminous high potassium calc alkali—alkaline series. The geochemical characteristics of REE show that the volcanic rocks belong to LREE enrichment type, enriched in LILE(Rb, K, Th, U, LREE) and depleted in HFSE(Nb, P, Ti) in trace element. The above features show that the volcanic rocks of the Pana Formation, Linzizong Group, in Xiongma area, are derived from continental crust remelting, belong to continental volcanic rocks related to subduction orogenism. At the same time, with the characteristics of the land—continental collision. Speculated that the volcanic rocks of the Pana Formation formed in the tectonic background when the neo Tethys oceanic crust subduction is finished and the Indian plate and Eurasian plate collision, time was about 38 Ma， i.e. late Eocene.