The paper is based on ordinary index to assess hiodiversity. Entropy is an important object to study. Entropy and other biodiversity indexes is used to assessed wilderness vegetation of Kelamayi in Xinjiang. The result shows entropy and other biodiversity indexes have corresponding in principle. Entropy is not only a fine assessed index as species diversity,ecological dominance and species richness but also manliest species of system which contributes to and evolutes to the system. The paper provides the new base to the assessment index of biodiversity.