With the development of commercial economy, advertising plays an important role in modern life. The success of the advertisements lies in how to use language to make ads more convincing and persuasive. Pragmatic presupposition is defined as an inference or proposition, which is commonly used in advertisements. This study aims to take Chinese advertisements as samples to explore language in ads and to reveal the effects of presupposition, which can give theoretical and scientific guidance for advertisements designing and let customer have a better understanding of advertising language.