Presupposition is one of the most important theory in linguistics,which is widely applied to oral communications in daily life.As a special type of communication,dialectal humorous discourse is of difference with humorous discourse in common sense,which is more closely related with local culture and more regional.Therefore,the application of theory of presupposition in dialectal humorous discourse is accordingly more complicated.The paper will put great importance on analysis in the application of theory of presupposition on the basis of collecting materials of dialectal humorous discourse.And then the paper will discuss the peculiarity of its reasons.