摘要：verbal humor carries rich cultural connotation and reflects the wisdom,communicative skills of the humor *** are many researches on verbal humor both at home and abroad,especially in the fields of sitcoms and literature from the perspective of pragmatics and cognitive ***,the researches on the humorous corpus of public speech are *** paper intendsto use qualitative research methods to explore the mechanism of verbal humor generation under the theoretical framework of cooperative principle and relevance *** the analysis in the paper,it points out that verbal humor can be produced by violating the cooperative principle,the gap between maximum relevance and optimal relevance,and the speaker’s expanding contextual *** cooperation principle and relevance theory have a good elaboration on humor in public speeches,but both have their own deficiencies in explanatory *** the combination of those two theories can better explain the generation mechanism of verbal humor.