Abstract：In recent years, the study of discourse markers has become a heated issue in conversational analysis and pragmatics. Causal discourse markers, as one category of discourse markers, are employed to express the cause-effect relationship, which is especially important to the argumentative writings.
The thesis, with the help of wordsmith 5.0 and Microsoft Excel, collected 92 pieces of argumentative writings by the junior students of English major in Xuzhou Institute of Technology to investigate the use of casual discourse markers from high-frequency, low-frequency and other improper uses. Throughout the study, some conclusions are drawn as follows:
1. Generally speaking, with the improvement of the English proficiency level, the causal discourse markers in the argumentative writings by our college English majors are used more and more widely.
2. English majors depended a lot on the use of causal discourse markers to express the causal relations in argumentative writings. So the density of the causal discourse markers is higher while the diversity is rather lower.
3. There are some high-frequency and low-frequency causal discourse markers in the English majors’ argumentative writings and some of them are improperly used.
In addition, some primary factors that may exert extensive negative impact on the use of causal discourse markers in the argumentative writings have been summarized as follows: mother language influence and teaching influence. At last, some effective implications are suggested to enhance the proper use of causal discourse markers in argumentative writings and to promote the writing abilities of English major in Xuzhou Institute of Technology.
Keywords: Causal discourse markers High-frequency use Low-frequency use Improper Use
摘要：话语标记语是会话分析和语用研究中的一个热门课题。因果类话语标记语作为话语标记语的一种，主要用来表达逻辑上的因果关系,对议论文的整体写作效果起到至关重要的作用。
本文收集了92篇英语专业大三学生的课堂议论文写作为研究资料，借助wordsmith 5.0和Microsoft Excel进行数据分析，从高频使用、低频使用和不合理使用三方面展开调查，研究徐州工程学院英语专业学生议论文写作中因果类话语标记语的使用情况。通过研究，得出以下结论：
1.总的来说，随着我校英语专业教育水平的提高，因果类话语标记语在议论文写作中的使用频率越来越高。
2.我校英语专业学生在议论文写作中对因果类话语标记语有一定的依赖性，因此相对于使用密度来说，使用丰富度偏低。
3.我校英语专业学生议论文写作中，有一些因果类话语标记语使用频率较高，有一些使用频率较低；其中还有一些不合理的使用情况。
此外，研究还揭示了影响我校英语专业学生因果类话语标记语合理使用的两个因素：母语影响和教学影响。研究可以促进我校英语专业学生对因果类话语标记语的正确使用，提高我校英语专业学生议论文写作的能力和水平。
关键字：因果类话语标记语；高频使用；低频使用；不合理使用
