Keywords : writing, genre based approach this study aims at examining whether the use of genre-based approach improves the writing ability of man banda aceh i students. quantitative approach with experimental study of pretest-postest control group design was undertaken to overcome the problems faced by students in learning writing skill. the sample were selected by using random sampling technique. the instrument used to collect the data in this study was test in form of written test. the researcher use t-test to find the differences between pre test and post test achievement. the result shows that there is significant difference between the mean score of pre-test from post-test for the experimental class. it increases from 58.78 to 80.6. however, for the control class, there is no significant increase in the mean score of students’ pre-test and post-test. it only increases 2.88 point from 52.56 to 55.44. theresult of t-score is 15.69 and the