摘要：Pragmatic vagueness is a manifestation that language has elasticity and is one of attributes of nature language. Pragmatic vagueness phenomenon exists in news report, law version and commerce report. Nowadays in adverting creations, advertisers take pragmatic vagueness as the strategy in order to make the most effective to strengthen the advertising attention, memory and persuasion in the limited time and space. At the same time, the pragmatic vagueness strategy also strengthens the advertising flexibility and appropriateness, compresses information and produces advertising aesthetic effect. In most circumstances, advertising companies use pragmatic vagueness to realize their advertising purpose and pragmatic vagueness offers strangely psychological hint to customers. This paper will firstly state pragmatic vagueness and advertising activities, and then analysis the function of pragmatic vagueness in advertisements.