Abstract: 【Objective】We aimed to clarify species composition, community structure and interspecific associations of broad-leaved evergreen forests at Huangshan.【Method】We calculated the importance value of species using the survey data of the forest dynamics plot with an area of 10.24 hectares, and screened out 14 dominant species by their important value. By means of variance analysis, χ² test, AC index, and Pearson correlation coefficient based on the 2×2 contingency table, we investigated the interspecific association of 14 dominant species at three different diameter classes.【Result】The variance analysis showed that weak interspecific associations occur at both the whole community level and the medium diameter class, whereas a significantly positive association was found under the small diameter class, and a significantly negative association was found under the large diameter class. The χ² test showed that total number of species pairs with significant and extremely significant associations under the whole, small, medium and large diameter classes were 29, 29, 30 and 25, respectively. The AC index test shows that the positive-negative association ratio under whole, small, medium and large diameter classes were 0.915, 1.263, 1.023 and 0.717, respectively. Pearson correlation coefficient test showed that the positive-negative correlation ratio under whole, small, medium and large diameter classes were 0.896, 1.275, 0.936 and 0.542, respectively.【Conclusion】There is a significant difference in interspecific associations among species of different diameter classes. Ratio of the positive to negative associations of species pairs was found to be decreased with higher diameter classes, while interspecific competition in the plot intensifies with higher diameter classes.