2。2Pragmatic Functions of Headlines

Wu(2009) started from the function of news headlines and explored optimal relevance explanation on the function of news headlines。 Wu believes, news headline is the best optimal relevance, which means authors use the way of generalize, references, emphasis to write the title, at the same time, authors will consider the length and complexity of the title, as  far  as possible provides readers with concise, briefly and clearly title。 But the purpose is always optimal relevance。 Zhou(2009) focuses on the analysis about pragmatic function of tag under the relevance theory。 She believes that the English newspaper headlines tags have semantic implication and structural adjustment function。 What’s more, for the reasoning process of readers, they have control and guide function。 For the convenience of the reader, English newspaper title tags have great effect on the related content searches。

Sperber and Wilson's relevance theory（2001) is to simplify the communication in a series   of

complex phenomenon as cognitive concept。 In essence, the relevance theory shows the balance between the cognitive efforts and benefits。 Cognitive process is to deal with minimum effort to obtain the maximum possible contextual effects, which means to obtain optimal relevance is the basic theory。 Hu(2005) analysed the cognitive context and relevance。 He thinks it is a great contribution of relevance theory that explains human communication behavior from the view of cognitive science。 And that optimal relevance is a measure to judge news headlines。