主题句是英语专业四、八级写作考试考查的重点,也是英语写作教学中的难点。本文在评价理论框架内,分析了英语专业学生在主题句写作方面的问题和失误,并根据评价理论的子系统提出了改进主题句写作的建议。 Thematic sentences is the focus of the exams written by the fourth and eighth level of the English major, which is also a difficult point in the teaching of English writing. In the framework of evaluation theory, this paper analyzes the problems and mistakes made by English majors in the writing of topic sentences. According to the sub-system of evaluation theory, it puts forward some suggestions to improve the writing of topic sentences.