Abstract: [Objective] Bayinbuluke alpine grassland was taken the research object to research the degradation succession of vegetation diversity in the hope of providing a theoretical basis for the scientific management of alpine grassland.[Method]By using the method of space to replace the time degradation gradient degradation successional sequence, the field investigation of plant communities during different alpine grassland degradation stages in Bayinbuluk was carried out.The variation of vegetation diversity was studied by using the index of α and β diversity.[Result]The results showed that Simpson index increased significantly by 9.6;-13.7; compared with non-degradation;and with the increasing degraded succession, Margalef index showed a slight increase and a significant decline trend, but the Shannon-Wiener index and Pielou index showed the fluctuation of upward then downward and upward change.In addition, with the worsening of grassland, the resource heterogeneity was decreased in the quadrat, but increased among quadrats, so the β diversity was increased.Cody index showed the tendency of "up-down", this result showed the species substitution rate increased first and then decreased.Bray-Curtis index was higher in light-degradation, mid-degradation and heavy-degradation grassland than non-degradation grassland, and it indicated that there were more common species among different degraded grasslands.[Conclusion]In the alpine grassland, species composition changed at different degradation succession stages, the forage grass with good palatability reduced, poisonous grass increased, resulting in reduction of the quality of grassland.