Abstract: The high-cold steppe is extensively distributed in the Qiangtang Plateau, Xizang autonomic region. This paper discusses the floristic composition, geographical elements of flora, life-forms and synusiae as well as ecological groups and growth rhythm of this type of vegetation. Seven groups of the steppe with reference to their ecological distribution principles are described. In comparison with the characteristics of the temperate steppe in the north, this type of steppe is remarkably distinct with the former. Both may be regarded as subtypes of the steppe.