Changbai Mountain has the only mountainous tundra habitat found in China. Interspecific associations among major tree species in three forestry communities on the north slope of Changbai Mountain have not yet been analyzed. In this study, we surveyed 35 quadrats in the three forest communities from 700 m to 1700 m of altitude, classified the samples using TWINSPAN, and analyzed for possible interspecific associations. The results show that (1) the 35 quadrats were divided into 3 different forest communities, a natural broad-leaved Korean pine forest, a natural secondary forest, and a spruce-fir forest. The 34 species were divided into 5 groups. The major trees species of the first and second groups were negative or neutral partial negative hard hardwood species. The major species of the third and fourth groups were positive or neutral partial Yang soft hardwood species. The fifth group was mainly composed of coniferous species. (3) Associations among major tree species in the natural broad-leaved Korean pine forest did not show any significant negative correlations, and no significant positive correlations were observed in the natural secondary forest and spruce-fir forest. (3) The percentage of closely correlated species pairs was 89%, 76%, and 47% for the natural broad-leaved Korean pine forest, natural secondary forest, and spruce-fir forest, respectively. Plant community stability and interspecies association did not tend to be positively correlated.