The objectives of the research are: (1) to identify whether or not animation movies can improve the students‟ writing skill; and (2) to describe the class situation when animation movies implemented. The research was carried out at SMP Negeri 2 Klego. It was conducted from April 2012 up to May 2012. The subject of the research was the students of class VIII D of SMP Negeri 2 Klego in the academic year of 2011/2012. The research was conducted in two cycles: four meetings in the first cycle and three meetings in the second cycle. It was optimized the use of animation movies as the media for teaching writing. There are two kinds of data: qualitative data and quantitative data. The qualitative data are collected through observation, interview, and questionnaire. The quantitative data are collected using test. The quantitative data are analyzed through descriptive statistic technique including pretest, test in cycle 1, and post test. The research findings show that the use of animation movies can improve students‟ writing skill and class situation. The improvement of students‟ writing skill includes: (1) the students organized their ideas coherently using appropriate generic structure of narrative; (2) the students used more appropriate vocabularies; (3) the students wrote their naratives in grammatically correct sentences; (4) the students used spellings and punctuations correctly in their composition. The class situation also improves which includes: (1) students were active and creative, they paid attention to the teacher‟s explanation; (2) they did all exercises given by the teacher. In addition, the students‟ mean score improved. It could be seen from their writing mean score of pre-test, post test in cycle 1, and cycle 2, that is 68.91, 73.12, and 76.71 respectively the last mean score is higher than KKM which is 74.00. Finally, it could be concluded that the use of animation movies could improve the students‟ writing skill and the class situation. Based on such findings as presented above, the researcher expects that animation movies could be used in other writing classes.