We firstly analyzed that the overall association characteristics of non-degraded and degraded Kobresia capillifolia communities by the variance ratio method.Then basing on 2×2 contingency table and important value of plant species,we investigated the composition of communities,interspecific relationship of plants and the stages of community succession,by using Chi square test,Jaccard index and Spearman rank correlation analysis.The results suggest that:(1)the differences in species composition between two communities are small;(2)the overall association of two communities shows significant negative correlation,and the interspecific relationship of each community are close on the whole;(3)most of the species of two communities have a weak interspecific association,namely,great independence,and the species pairs showing a negative or a positive association respectively occupies about half of total species pairs.It is studied that both non-degraded and degraded K.capillifolia communities are in the unstable stage.