Exploring the canopy density and canopy overlap of the evergreen broad-leaved forest and their influencing factors can reveal the structure characteristics of the evergreen broad-leaved forest and provide basis for its scientific management.Taking the evergreen broad-leaved forest in Tianmu Mountain Nature Reserve of Zhejiang Province as the research object,a large fixed 100m×100m land was set up,and every tree survey was conducted.GIS technology and statistical analysis methods were used for data analysis including canopy density,canopy density of tree species,canopy overlap and their relationships with stand factors and trees distribution pattern.The results showed that:1)the 1hm² standard in-ground tree species of the Tianmu Mountain evergreen broad-leaved forest had 36 families,83 species,and 2 625 trees with DBH≥5cm.The dominant tree species were Fagaceae,Camellia,Lauraceae and other evergreen species.The dominant tree had 8 families,13 species,1 755 trees in total.2)The canopy density of the evergreen broad-leaved forest in Tianmu Mountain was 0.81,and the canopy overlap was 203.55%. There was a significant positive correlation between the canopy density of tree species,the number of trees,the canopy area,and the cross-sectional area of breast height. 3)The dominant tree species contributed 90.11% to the forest canopy density. The dominant tree species of Fagaceae,mainly Cyclobalanopsis glabra,had the greatest impact on the forest canopy,and contributed 51.32% to the forest canopy density. 4)The spatial distribution pattern of forest trees wais an important factor that affected the degree of canopy overlap.