This paper centers on the research on the enhancement of the argumentative writing ability of medical school learners through Email.And in recent years,the argumentative writing has been examined much more frequently that other writing styles in Band-4 Exams.As to how to enhance their argumentative writing ability,the author tries to use Email as a way of communication.Email as an instantaneous communication way,could be used to the utmost in this research.All the data collected for this research is true.The author made a careful analysis.And this paper will give us the result of this practice.