Abstract：Vagueness is one of the primary properties of natural language. With the development of economic globalization, the activities of international business become more frequent than ever. In business correspondence, as a kind of communicative behavior, the skill of using vague language and its pragmatic function are playing a vital important role of business success. The appropriate use of vague language will not affect the accuracy of business communication language expression, what’s more, to some extent, can make the language expression more vivid and flexible. And at the same time, the vague language will appear to be more rigorous, accurate and courteous, which will strengthen the flexibility of business operation and engender a positive effect, so as to achieve a fine communication environment with each other, and achieve business purpose.
Key words: Business Correspondence; Vague Language; Pragmatic Function；Business Purpose;