The dominant species is POA Pratensis, which distributes in the range of 3800-4200m, with 90% coverage of herb layer and 3-5cm height of grass layer. No trees, shrubs distribution, for grazing pastures. Alpine meadow is the most widely distributed, the most important type of grassland communities. No tree, shrub distribution, mainly for mosses, Gentian, sedge and grass and other Alpine herbs, grass is the dominant species.