Abstract: In this paper,alpine grassland in Litang County was regarded as the research object,analysis was made of vegetation characteristics of different types of grassland in this area by using the method of the space sequence research instead of time series.The results showed that there were 30 families,89 genera and 174 species of common plants in the sandy grassland in the northwest of Sichuan Province including 6 families,8 genera,15 species of shrubs,and 24 families,81 genera,159 species of herbaceous plants.Besides,the coverage and biomass (total biomass,aboveground and underground biomass) of all kinds of sandy land showed regular changes with the aggravation of the degree of desertification.The change sequence of the coverage rate from high to low was non sandy land (control),mild sandy land,moderate sandy land,severe sandy land,extremely heavy sandy land.Thirdly,the number sequence of plant species was moderate sandy land,severe sandy land,mild sandy land,non sandy land (control),extremely heavy sandy land.Lastly,the sequence of community dominant species number was moderate sandy land,severe sandy land,mild sandy land,non sandy land (control),extremely heavy sandy land without obvious dominant species.