Abstract: Based on the data collected in the recent years by the scientific expedition in the Qinghai-Xizang region, the principal structural features of Himalayas and Qinghai-Xizang Plateau are discussed from viewpoint of plate tectonic theory.In the light of a lot of data, such as on the geological history, the sedimentary characteristics, the distribution of Gondwana sedimentary facies, ophiolite suite, melange and exotic blocks, the crustal deformation nature, the regularity of magmatic activity and paired metamorphic belt on both sides of Yarlung Zangbo River, this work deals with the pattern and nature of plate motion, makes a subdivision of Himalayan orogeny and gives a preliminary analysis of its character as well.A possible model on formation of Qinghai-Xizang Plateau by multi-underthrusting and multi-matching is presented and it is suggested that the Bangong Co-Dongqiao tectonic belt can probably serve as the northern boundary of Gondwana land. And we propose a new mechanism that the Yarlung Zangbo Jinag tectonic belt was opened in Mesozoic and closed in Early Tertiary.