Based on the data resources investigated from the field, the interspecific relationships among 780 species pairs, which belong to 40 dominant plant species of Qilihai wetland vegetation were analyzed by using methods of χ²-test and Spearman's rank correlation analysis. The results showed that:(1) Analyzed by χ²-test, there were positive correlation for 357 pair-species and negative correlation for 423 pair-species.(2) By applying Spearman's rank correlation analysis, there were positive correlations for 356 pair-species and negative correlations for 424 pair-species Analyzed by. It clearly demonstrated that the 2 test methods derived similar results. Compared with χ²-test, Spearman's correlation coefficient was more sensitive. The proportion of significant correlated species pair was 35.77%, which indicated that most of the species were independently distributed and had a loose relationship with each other. This further indicated that the vegetation might be in a state of degradation. The 40 dominant species were divided into 3 ecological species groups. Species in the same ecological species group had the same way of resources utilization and biology requirement. However, we observed that species belonging to different groups had the trend of succession and transform into each other.