Abstract: The Prunus sibirica shrub-steppes in Xingan League of Inner Mongolia are studied using a number of or-dination methods,including polar ordination (PO),principal component analysis(PCA)ordination andcorrespondence analysis(COA)ordination,22 polts of Prunus sibirica shrub-steppes are classified into 4ecological groups and 8 associations. 2-dimensional ordinations of PO,PCA and COA indicate thechange of plant communities with the status of soil water,heat and structure,and ecological environment reflects the distribution of plant communities. The three methods can be improved and replenished each other,and similar results are obtained by all of them.