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meaning, especially under the condition of lacking specific context. Second, language is ambiguous. There are a lot of ambiguous words, which easily cause the uncertainty of language expression. For example: “She is very beautiful”, “beautiful” or “not beautiful” is a pair of ambiguous conception. Not only the meaning of “beautiful” is an ambiguous, but also the expression is related to people’s different aesthetic sense and their various psychology assessments. One person thinks she is beautiful, but the other has his different opinion. Moreover, using euphemism also adds some ambiguity. For example, one puts forward a suggestion hoping the leader could solve the problem quickly, the leader who does not want to take it into consideration at once may response in an indirect way, and “we may have more discussion about it ”. If the listener is experienced enough, he may shut up his mouth. 2.Definition of context and its factors Because of the above characters of language, people misunderstand each other when they use language in communication .The characters affecting communication negatively causes the communication miscarriage .So, you must combine the meaning of discourse with the specific context. Context is an important theory in pragmatics; it has strong effect on research in pragmatics, because language is always used in certain communication environment. Analyzing language phenomenon, you must combine it with the context it relied on. But what is context? About the definition of context, different savants have different views. J R Firth , linguist ,British deemed “context is not only including the above and below sentence, but also including the social environment of language and the relationship of language and social environment”; Fishman, American sociologist pointed out “context is the social situation, which is defined by common behavior rule in language communication, including place, time ,identity ,topic ,etc.” Professor Qian-Guanglian of our country said, “Context is substantial and social environment that expresses the language behavior ” We can concluded it with just one sentence, “context is the environment of language usage”.(Brown&Yule,1983) “It is to be understood as the surrounding, in the widest sense, which enables the participants in the communication process to interact, and makes the linguistic expressions of their interaction intelligible.”(Wei-Huiliang Xie-Yuanhua, 2000). Context contains the following factors: (1) The Linguistic factor: the verbal context of the topic, for example, "How old was I when you first took me in a boat?” ——"Five and you nearly were killed When l brought the fish in too green and nearly tore the boat to pieces．Can you remember?” (E．Hemingway：The Old Man and the Sea) "Green" is obstacle for you to understand the discourse，and in the dictionary it has over 20 kinds of meanings．The most approaching meaning to this discourse is hard to know, if you only look up the meanings of the word。So thee verbal context can help you，especially from the following sentence“nearly tore the boat to piece"，if fish can nearly tear the boat to piece，it must be strong fish .We may easily make a decision to choose the meaning“vigorous"． (2) The social intercourse factor：it is the objective environment where the addressor uses language and the addressee understands language，such as place of communication, identity of addressor and addressee， status and their relationship and the