This study aims to improve the skills of writing expository texts in class VIII C students of Sungai Raya Junior High School 4. The method used is an action method which is described in the form of a qualitative research. The subjects of this study are class VIII C students who collected of 32 students. The data obtained is the result of writing an exposition text made by students using the CBL or Case-Based Model with media narration, the results of interviews with subject teachers, and an APKG 2. The actions taken in this study were based on three cycles. The results obtained shown that the skill of writing expository texts using the CBL model and broadcast media has increased with an average score of 83.28 from pre-cycle activities which obtained an average score of 62.12. This is because students are increasingly understanding the themes used in writing exposition texts. While in the pre-cycle students still do not understand the structure of the text so that some students only write one paragraph. The structure in the exposition text consists of three aspects, namely the thesis, argumentation, and reaffirmation. After the application of the model and media, it is easier for students to give their arguments in writing of exposition texts.
