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Modern information network such as digital library contains much more data than ever before. These data are globally distributed, become accessible to huge, heterogeneous users easily. On the other hand, the enormous amount of information requires powerful tools for the user to find the relevant data. One such tool is thesaurus. The thesaurus as an ontology is playing an increasingly important role in knowledge management and information retrieval of digital library. The paper reconsiders the nature of thesaurus from the view of ontology. It proposes the approach and ideas of Chinese thesaurus automatic construction. Some experiment results and future work are also described in the paper. [ABSTRACT FROM AUTHOR]