Teacher＇ s responses to student＇ s performances has great influence on a student＇ s development. So, teachers should pay more attention to the art of their language used to response to students performances. Vague language has rich rhetorical functions, such as ： implicit , indirect , flexible, Based on its rhetorical functions, this paper analyses its communicative functions ： polite , euphemistic and face protecting in English teaching course. The proper use of vague language can help teachers＇ language achieve better communicative effect.%教师课堂评价性语言对学生的发展会产生很大影响，因此，教师在对学生进行评价时要讲究语言表达的艺术。模糊语言以其自身的含蓄，委婉，灵活等修辞功能在交际中具有：礼貌客气，委婉含蓄，保护面子等潜在的交际功能。在教师的评价语中恰当地使用模糊语言有助于评价语取得更好的表达效果。
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