From the perspective of critical discourse analysis the essay takes Halliday's functional theory as the analysis framework. In the perspective of ideational fimetion, the official anti-corruption discourses mainly use metaphorical analogy to reflect the objective reality and ideology and to illustrate reasons from visual expressions; in the perspective of interpersonal function, quoting analogies are mainly used to persuade, to reason and to implement early warnings and colloquial analogies are to build close relationship between the officials...