Linguistic Expression is a kind of ability in the social life as it is used to display one's wisdom, eloquence and personal charm. It represents the characteristics of the opinion of the ad-dresser and the speaking technologies in it in turn influence the addresser ideologically. This thesis is an attempt to explore inter-personal metafunction though Martin Luther King's I have a Dream,in the framework of interpersonal meaning with Halli-dayan Systemic-Functional Linguistics (hereafter SFL), aiming to testify the operationality and practicability of Hallidayan SFL to-wards the teaching of Junior college students' and Secondary specialized school students' speaking ability.% 语言表达是人类交际中的一种重要活动，因为它可以彰显个人的智慧、雄辩能力以及魅力。语言在一定程度上不但用于传达演说者的观点和思想，其技巧及其运用会辅助观点和思想，对听众产生重要影响。本文主要采用人际功能的分析方法，分析马丁·路德·金的《我有一个梦想》。旨在探讨韩礼德系统功能语法对于提高现代大中专生语言能力教学的可操作性和实践性。
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