A structural graph of communities not only reflects the position of forest species in community, but also reflects the dynamic of species and the succession tendency of communities. Thus, it can illustrate in a full way the function of each species in a naturally mixed forest. There are two ways to determine the superiority of middle-subtropical evergreen and broad-leaved species in a forest: big-tree structural graph (V) and wood structural graph. The results of determination show that big-tree structural graph (V) will reflect the composition characteristics of stable communities while wood ...