“下水文”是指教师面对布置给学生的作文题目,亲自构思、选材、布局、谋篇的一种创作活动,是给学生起写作示范引导作用的一种创作活动。下水文对作文教学有着积极而重要的作用,叶圣陶先生说:“语文教师教学生作文要求老师经常动笔,或者跟学生写相同的题 ”Underwater “ refers to the teachers in the face of the composition of the essay topic for students, personally conceived, material selection, layout, seeking articles of a creative activity, is to give students a model to guide the role of a creative activity. Hydrology has a positive and important role in the teaching of composition. Mr. Ye Shengtao said: ”The teaching of Chinese teachers requires that the teacher write frequently, or write the same questions with the students