Abstract: This paper deals with the composition of ant communities and species diversity.Trap and sample plot were used in the investigation in the fragments of seasonal rain forest of different size and environmental status.The ants collected in the 4 spots belong to 4 subfamilies,24 genera and 50 species.The number of species in Chengzi Holly Hill was the highest.Dominant species in these spots were different.The common species were fewer and only 4 species appear in all the spots.The similarity of ant communities between plots was low and the coefficient was 0.1622-0.3548.A dendrogram constructed by the Jaccard index showed that similarity between Chengzi and Botanical Garden Reserve was the highest (0.3548).Species diversity indexes (H) of ants in the Chengzi Holly Hill,the Manyangguang Holly Hill,the Botanical Garden Reserve and the Nature Reserve were 1.7771,1.6521,2.3785,0.9612 respectively.