This research was intended to investigate whether the cooperative script technique is effective to improve reading comprehension ability to thetenth grade students of senior high school.This research focus on narrative text as the material and the tenth grade students of SMAN 1 Larangan, Brebes in academic year 2015/2016.This research was using quantitative method , with the pre-test post-test control as the design of the research. A group consisting of 30 tenth graders was taught using cooperative script as the technique and another group consisting of 30 tenth graders represented the control group. A pre and post test was applied on both groups. The quantitative data were taken from result of those achievement tests done. After being collected, the data were analyzed using t-test formula. The study findings indicated that there are statistically significant differences at (α ≥ 0.05) in reading skills among the mean scores of the control group and the experimental groups in favor of the experimental groups. The result indicated that that the improvement of the scores in experimental group were influenced by two important things which can be found during cooperative script technique implementation. First, student reading ability was influenced by retelling and working memory activity. Then, the students reading ability was influenced by the student motivation in reading. At last, The results suggest that cooperative script could be a potentially useful technique in teaching reading for ESL learners.Keywords: Reading Comprehension, Narrative text, Cooperative learning method, Cooperative script technique