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The species compositions and diversity of twelve natural forest communities in The species compositions and diversity of twelve natural forest communities in Dongguan city were studied based on the data of plots. A comparisons were made between them and the subtropical evergreen broadleaved forest in Guangdong province.The results indicated that: the values of species richness, ShannonWiener index, Pielous evenness index and Simpson index were 54～147, 2.44～4.08, 58.08%～86.28% and 0.03～0.24 respectively； ShannonWiener and Pielous evenness indices changed accordingly with the species rechness, but the changes of Simpson index was contrary to that of ShannonWiener. The values of ShannonWiener and Pielous evenness indice were significantly lower than that of the subtropical evergreen broadleaved forest in Guangdong province. Concerning comparison among different layers, the species richness and the values of ShannonWiener index of shrubs were the greatest, followed by those of trees, lianas and herbs. The twelve natural forest communities were divided into eight plant formation. And the results of cluster analysis was closely related to dominant species, degree of dominance, species composition and diversity.Considering the succession process of forests, we speculated that Sapium discolor+Spondias lakonensis community, Aporosa dioica+Schefflera heptaphylla community, Itea chinensis+Sapium discolor community and Acronychia pedunculata community were at the fourth stage, and the other eight communities were at the five stage. Meanwhile, Cleistocalyx operculatus community, Rhodoleia championi community and Lysidice brevicalyx community were at a transition period to the stage of mesophytic evergreen broadleaved forest (the climax of forest succession process), and were at the top stage of the Dongguan zonal forests at present.
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