Abstract: The Yarlung Zangbo River fault zone cosists of four arcuate faults bending towards the southwest. The fault zones had become successively subsided from the northwest to the southeast to receive sediments from late Triassic up to the Quaternary,with the adjoining regions uplifted. The crustal movement that brought about the fault zone are characterized by an uplifting on the north and subsidence on the south of the region,the latter becoming subsequently elevated.