In the teaching reading process, many students have problems comprehending an English text. Reading is an activity that is very important in learning especially in the education field. The purpose of the study is to describe the implementation of using story mapping on narrative text to teach reading comprehension and to find out the problems faced by the teacher teaching reading comprehension using story mapping on narrative texts in Junior high school. This study used a descriptive case study to answer the research questions. The three techniques collected the data; were pre-observation, observation, and interview. Descriptive analysis was used to present the result of the study in the form of a descriptive explanation. The result of the study shows that the use of the story mapping technique as a technique in teaching reading can help the students understand the narrative text easily. The problems face during teaching reading using story mapping on narrative text is following; lack of literacy about the narrative text in English, the teacher's difficulty managing the students during the learning process, the students' less motivation to learn English, the students less of vocabularies, the students don't understand the meaning of the word. The researcher hopes that it will be used as an alternative technique for exploring the reading comprehension of junior high school students.