In order to find out species composition and interspecific relationship of reed community in Dunhuang Westlake Wetland of Gansu,we investigated the relevance and correlation of 28 sepcies pairs (between species to species) composed of 8 dominant species of reed community in Dunhuang Westlake Wetland of Gansu,according to quadrat investigation of plant community,on the basis of 2×2 contingency table,using analysis of variance,chi-square test,Ochiai index,Dice and Jaccard index.The results showed:(1)The overall correlation among dominant species of reed community showed a significant positive correlation;(2)Among the 28 sepcies pairs,20 pairs showed a positive correlation accounted for 71.4% of the total correlation pairs;8 pairs showed a significant negative correlation accounted for 28.6% of the total correlation pairs;(3)Reed community species pairs showed a significant positive correlation,and the logarithmic ratio of positive and negative correlation was 2.5.The positive correlation was dominated (correlation was weak) and the negative correlation was low (correlation was strong).The correlation and probability of common occurrence of 28 species were not high,and most showed no correlation.