This article is to expatiate on the features of the thesaurus,namely,“easy access,abundance of words and practicability”,in con- nection with the design of the thesaurus,the inner structure of the entries and the inclusion of words and phrases.

This paper attempts to apply the mental lexicon theory to the compilation of thesaurus.

Meanwhile,some English and Chinese monolingual thesauri have provided practical support to Chinese-English bilingual thesaurus compilation.

This paper proposes an algorithm combining statistics with rules,called the priority merger algorithm,which merges phrases by calculating the relationship of words,checks phrases by using phrase rules and a semantic dictionary in grammar and semantics,and recognizes Chinese phrases by the means of hierarchic analysis.

Through building it′ "semantic dictionary" module and " primitive-feature base" module in retrieval system, have finished the organic integration of two kinds of retrieval methods and improved the performance of image retrieval system on existing technical level.

To compute the semantic relatedness of words,a frequently-used method is to use the classified semantic dictionary.

Automatic query classification via constructing semantic lexicon;