Abstract:The pitfall traps were used to sampled ant in two fragmentary dry tropical seasonal rainforest of ‘Holy Hills’ of Dai nationality and one continuous moistness tropical seasonal rainforest of Nature Reserve in Xishuangbanna area on August in 1997 and March in 1998. The species and individuals composition of ant groups were studied in three rainforests. The D MA , J, d, Ds, H′ index and the pattern of relative abundance of species were used for comparing the diversity of ants in three habitats. The result...