Abstract: By analyzing the plant community on the purple soil in Hengyang Basin,the results show that:(1) The main types of vegetaon in the Hengyang Basin.The tree species are 8 families 10 genera and 12 species, the shrub communities are 20 families 42 genera and 58 species ,the herbage are 28 families 58 genera and 78 species in total;(2)there are an tendency in richness and bio-diversity in Hengyang Basin,the north-facing slope＞the south-facing slope;the down slope＞the middle slope＞the upper slope.