Based on the field survey of Sanchading Nature Reserve in Deqing, Guangdong province, the paper analyzed it′s species′ constitution and structure by using Margale richness index, Simpson dominance index, ShannonWiener index, Pielou evenness index. The result shows that, there are 52 families 94 genus 113 species in annual growth Eucalypt, 56 families 99 genus 121 species in the triennial Eucalypt, the dominant species of undergrowth are Rhus chinensis Mill., Litsea cubeba (Lour.)Pers., Ampelopsis cantoniensis (Hook. et Arn.) Planch, Gelsemium elegans (Gardn. et Champ.) Benth., Clerodendrum fortunatum L., Miscanthus sinensis Anderss, Dicranopteris dichotoma (Thunb.) Bernh. etc. There are no significant differentiation between the annual growth Eucalypt and the triennial Eucalypt in their each diversity index; the species diversity index of triennial Eucalypt is bigger than the annual growth Eucalypt on the whole, which indicates that the species diversity index of Eucalyptus plantation has a increasing trend with the increase of stand age.
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