Under the environment of the advertising economy, it's unnecessary to depict the functions of the ads. The design of the ads is strategic. Based on the analysis of the semantic presupposition and pragmatic presupposition in the advertising discourse of both Chinese and English, the paper is helpful to help readers understand the stability, variability and transferablility of the semantic presupposition, as well as the felicity and the common ground of the pragmatic presupposition. Meawhile, it is helpful for the understanding of the strategies of advertising discourse.