【Abstract】Writing skill is essential in English learning.The present thesis makes an attempt to explore the universal features of English coordinators in argumentative essays of the students in Pre-departure Training Department of BLCU.This is accomplished by conducting a contrastive analysis between the native speaker corpus and a self-built corpus based on the computerized corpora and database software tools.It will also find the difference and the degree of difference between the two corpora.And，it will be detecting the problems behind these performances and the relevant causes，while offering some corresponding solutions from the qualitative perspective.The study turns out that the Chinese English learners “misuse” and “overuse” English coordinators to a certain extent in the writing of argumentative essays compared with the native English speakers，which is mainly attributed to such factors as：language transfer，overgeneralization，the lack of the awareness of stylistic and different ways of thinking between eastern and western people.
　　【Keywords】 writing skill； coordinators； corpus； corpus linguistics
　　1.Research Background
　　Writing is an essential dimension of language acquisition.In general，Chinese English learners’ English level and examination achievement have a noticeable improvement，however，their English writing ability and writing achievement do not make the same progress as other items，such as English reading and speaking.（Pan Jun，1999） Cohesion and cohesiveness are generally thought of as nature of “excellent composition”.（Halliday