One of the important learning in college writing is a Revision. They are often used to revise the writing by self-correction, peer correction and instructor correction. This paper is written in order to diagnose such effects of learning on Methods of Revision. For this study, the experiment was done in three classes and scores were compared between first drafts and revised drafts. First, the improvement of the total score shows that they are in order peer correction, instructor correction and self correction. The followings are the results for details. Self correction doesn’t have significant difference in themes, contents and sentences. Self correction shows the writer to fail to look at his writing objectively. In adequacy of theme, the peer correction is better than the instructor correction. To change the subject of writing, the advice of peers is more effectively than the advice of instructor. The consistency of content also shows that the advice of peers is better than the advice of instructor. At the instructor’s correction, it is not reflected the correction of content more while peers correction is mostly reflected the content of correction. Students believe more the peer correction rather than instructor correction. The case of self correction has more inappropriate sentence in revision of sentence. One the other hand, the peer correction and instructor correction has a lot of adequate sentence