Abstract: The distrbution regularity of Nostoc commune in different living environments was studied by using the plot method.The community feature and biomass of the Nostoc commune community were analyzed.The results showed:(1) the specific composition of Nostoc commune community is 38 species,34 genera,21 families and 14 mon-family mon-species;(2) the vertical structure of the community is the shrub-layer and grass layer and cover plant layer;(3) average biomass of it is 10 kg/hm²,and dry weight 7 3 kg/hm² and wet weight 140 kg/hm²;(4) natural water content of it is 42% and water holding capacity 18.6%.The biomass is the largest in altitude 600～800 m;and (5) Nostoc commune consists with Bochriobloa ischaemum and Stipa in the distribution.