Thematic theory plays an important role in Functional Linguistics. Understanding the theory on division of theme and rheme provides the guidance for students in understanding the whole discourse structure at macro level and mastering the writing skills of cohesion and coherence, which can help the students in improving their writing ability. This is discussed in the paper which can avoid the deficiency of the traditional teaching method in which that lexicon and syntax are stressed.%主述位理论是功能语言学的重要理论。通过对句子的主位和述位的区分，对从宏观上掌握语篇的行文结构、衔接手法等方面有很大的指导作用。从主述位理论出发，培养学生在写作中布局谋篇的整体能力，避免只重视词汇、语法等的传统教学方法，对大学英语写作教学有很大的推动作用。
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