The writer implemented the CDO strategy in order to make the students’ writing ability increased. The aims of this research were to know the students’ writing ability before using CDO (Compare, Diagnose, Operate) strategy. This research used quantitative approach. Pre-experimental was chosen by the writer in the form of pretest, treatment, and posttest design. Subject of the research was the tenth grade students of SMAN 6 Kediri, and the sample was X IIS 2 which consists of 18 female students and 18 male students. The writer conducted two meetings and technique analyzing pretest and posttest was used formula of T-test calculated by SPSS v.23. The result of this research showed that the total mean score of posttest was (69.1) and the total mean score of pretest was (54). It means that total mean score of posttest was higher than pretest. T-score was showed in the report of t-test (10.0003). And t-table in the level of significance 5% (2.045). It can be seen that t-test was higher than t-table. In conclusion, there were significant effect when CDO strategy was implemented in teaching writing especially descriptive text. In addition, CDO strategy could be applied to accomplish the goal of teaching writing.
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