Abstract: Mt. Namjagbarwa, 7782 meters above sea level, is the highest in the East Himalayas and the piedmont belt was enclosed by Great Bend Gorge at the Yarlung Zangbo River. Mt. Namjagbarwa is a "△" shaped fault block with strong uplift speed. The great Bend Gorge at the Yarlung Zangbo River around Mt. Namjagbarwa is an antecedent valley adopted oneself to complex structure of arcuate circumstance. The geomorphological developing progress at Mt. Namjagbarwa region is very complex and ancient. During Precambrian period(the absolute age is about 749 million years)the area belonging to one part Of the Indian Plate was located in the upheaveldenudation region. Following the northward drifting of the continent thrusted under the Qinghai-Xizang Plateau this area had changed the northeast part of the Indian Plate and then the European-Asian and the Indian Plate connected together(the absoluted age is about 140 million years). Starting the Quaternary the neotectonics turned to intermittent uplift. The exogenic process of ice-age and intermittent age influenced the geomorphological developments and circumstance changes,especially, after the Middle Pleistocene because the crust lift in this area was arrived at the largest Mt.Namjagbarwa rose as a natural barrier.Meanwhile, the action of moisture passageway of the Great Bend Valley at the Yarlung Zangbo River got stronger and stronger.Its powerful influence changed the plateau climate, biological groups, ancient and modern human survival, glacial evolution and other phenomena of physical geology.