Abstract: Objective Through studying different degraded degrees grassland community structure characteristics in Bayanbulak alpine steppe,the project aims to provide a theoretical basis for rational utilization of grassland degradation.Method Using sampling method to investigate species composition,community structure and analyze ecological economic groups and the relationship between species diversity and aboveground biomass in Bayanbulak degraded grassland.Result With the increase of the degree of degradation,the Stipa purpurea,the dominant species of grass was gradually degenerated into a small low Koeleria cristata.The importance values of index species of alpine steppe degradation,such as Leymus tianschanicus and Potentilla sericea increased;The aboveground biomass of Gramineae and Leguminosae forage gradually decreased;Aboveground biomass of the community was significantly reduced by 50; (P ＜ 0.05).There was a significant linear positive correlation between aboveground biomass and species richness index and a significant linear negative correlation between the diversity index and evenness index.Conclusion Degradation grassland vegetation community structure resulted in a significant decrease in grassland quality and productivity,and the species richness of grassland communities affected grassland productivity.