Abstract: The developments in stratigraphy are involved in the division of the surveyed area into the Gangdise-Nyainqentanglha-Tengchong stratigraphic province and Bangong-Nujiang suture zone; subdivision of the Bangong-Nujiang suture zone into the Nyainrong microcontinent and Jueweng-Yulashan-Xagquka mélange zone; redivision of the Nyainrong microcontinent and Lagongtang Formation; re-establishment of the Gajia Formation; reconstruction of the Guoqu Group; disintegration of the Muggar Kangri Group into three group complexes. Petrologically, new discovery includes a suite of the Late Permian-Early Triassic ophiolites in the southern part of the surveyed area and ophiolites in Duolie, Dagring Village. Tectonically, the tectonic units consist of the Gezu-Xagquka suture zone and Sangxung-Nagqu-Midika slab in the surveyed area.