Abstract:The ordination (DCA) and the regression analysis methods were used to study the relations between the Gobi desert plant communities as well as the distribution of the dominants and the environment in Anxi. The results indicated that the coverage(C) and density(D) of the plant communities have a close relation to the annual precipitation(R), but the species richness(N) of the plant communities has a relation to the salt content(S) in the soil. Their regression equations are as follows: C = 0. 051 968 163e0.040786821R (R = 0.95, P < 0.01), D = 0.27 147 913e0.052741829R (R =0.96,P Nitraria sphaerocarpa Maxim. > Sympegma regelli Bge. > Salsola passerina Bge. > Ephedra przewalskii Stapf., but the resistibility to salt of the main dominants was found in the order as follows: Salsola passerina > Reaumuria soongorica > Sympeg- rna regelli > Nitraria sphaerocarpa > Ephedra przewalskii.