Presupposition is a very important linguistic concept that originates from philosophy.It is often considered as a kind of pragmatic inference.In linguistics it can be classified as semantic presupposition and Pragmatic presupposition.This article will deals with semantic presupposition.Besides the most important characteristics constancy under negation,presupposition boasts some other characteristics,namely unidirectionality,subjectiveness and latency,which exactly fulfill the demands of advertising.Because presupposition,used in advertising,can not only convey more information rather than just literal meaning,but also attract the audiences to make their own inferences,and accordingly avoid the possible risk caused by ostentation or direct assertion.On this account,presupposition is adopted into advertising as a pragmatic strategy. Presupposition is a very important linguistic concept that originates from philosophy. It is often considered as a kind of pragmatic inference. Linguistics it can be classified as semantic presupposition and Pragmatic presupposition. This article will deals with semantic presupposition. Besides the most important characteristics constancy under negation, presupposition boasts some other characteristics, namely unidirectionality, subjectiveness and latency, which exactly fulfill the demands of advertising. advertising. cause presupposition, used in advertising, can not only convey more information rather than just literal meaning, but also attract the audiences to make their own inferences, and accordingly avoid the possible risk caused by ostentation or direct assertion.On this account, presupposition is adopted into advertising as a pragmatic strategy.