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Botanical-geography researches of cryophyte polster formation (Stellaria pulvinata Grub) are made. It is formed by a stitchwort polster (Stellaria pulvinata Grub.) – an endemic species with local distribution in the cryoarid region of Central Asia – on highlands of the Mongolian Altai (2500-3800 m above sea level). Actual distribution of a species is revealed, the analysis of a coenotic diversity of an endemic mountain cryophyte polster formation of Stellaria pulvinata is carried out (three classes and ten groups of associations are allocated). The high-rise structure of belts with participate of the cryopetrophyte polster communities is defined. They participate in composition of two high-rise belts – the cryophype bunch grass steppe belt (2800-3200 m) and the cryophyte kobrezia and sedge tundra belt (3200-3500 m), and they also sporadic meet in the subnival belt (3500-3800 m).