If you were a high school boy, you would have learned rhetorical styles, you would have practiced at how to give a synkrisis speech, a speech of comparison.

Rhetorical Structure Theory is a representative school of American Functional Linguistics, with its aim to provide a formalized framework for the analysis and generation of language.

The thesis is to briefly review the achievement of Liege School from three aspects:theoretical base of Common Rhetoric, theory of figures of speech and rhetorical theory of poem.