Out of 13 dominant species of plants growing in saline alkaline soil in Inner Mongolia,3 genera,26 species of AM fungi were isolated.Among them 3 species of Acaulospora,1 species of Archaeospora and 22 species of Glomus were identified,and Glomus geosporum and Glomus versiforme were the dominant ones in the region.All the 13 species of plants were susceptible to infection of AM fungi,and Zae mays and Iris lactea were the highest in AM fungal colonization rate,reaching 100%;AM fungal spore density of rhizosphere soil ranged from 29 to 182 ind g^-1 dry soil,and among the 13 species,Oryza sativa was the highest (182 ind g^-1 dry soil).Furthermore,AM fungal colonization rate of the dominant plants varied with soil types,showing an decreasing order of meadow solonchak>alkalized solonchak>salined meadow soil>alkalized meadow soil,but in terms of AM fungal spore density,alkalized meadow soil was the highest (101 ind g^-1 dry soil),followed by alkalized solonchak,meadow solonchak and salined meadow soil.No significant correlation was detected between AM fungal spore density and colonization rate