Abstract: The succession law of the alpine meadow was studied with the method of quantitative analysis under the different grazing intensities in this paper. The results have proved that there are close successive relations among communities under different grazing intensities. Clustering result shows that when correlation coefficient R>0.851), 24 species plants of a community were grouped into 6 types, they respectively belong to dominant, constructive or accompanying species of successive different phases of a community and that when R>0.870, communities under 6 grazing intensities were grouped into 2 types. They respectively belong to community taking grasses as polydominant and of 2 layer structure, and taking Kobresia humilis and forbes as polydominant and of 1 layer structure.