Abstract: This paper deals with the floristic comparison and analysis of the alpine region where high-er than 4200 meters above sea level in the Qinghai-Xizang(Tibet) Plateau. Due to the special physio-geographical environments, the zonal vegetation types of this region mainly include alpine scrub, alpine meadow, alpine grassland and alpine scree, spare vegetation, but the plant species are relatively rich, amounting to 1816 species and 204 infraspecific taxa (variety, subspecies and form) of 339 genera and 67 families of seed plants. Based on the phytogeographical, systematical and paleobotanical researches and analysis of the whole flora and the cytological observations of 57 spe-cies, the flora of this region is characterized by its temperate nature, a close relationship with Sino-Himalayan flora and a young flora with complex origin history which was formed gradually during the uplifting of the Himalayas and the Qinghai-Xizang Plateau.

Key words: Qinghai-Xizang Plateau