This study is intended to find out the effect of using Cooperative Script technique on the students' reading comprehension of the first grade at SMA Negeri 4 Kediri. The research approach used in this study was quantitative with a pre-experimental technique. Technique of collecting data used was pre-test, treatment, post-test. Pre-test which instrument to know the reading comprehension of the students before being taught by Cooperative Script techniques was implemented before treatment which consists of several steps, while post-test was applied after treatment. The participants were 34 students. Data analysis used was T-test counted with SPSS version 23. The result showed that the score of post-test was higher than pre-test with mean score of pre-test was 58.82 and mean score of the post-test was 81.18. Thus, it can be said that Cooperative Script had significant effect on the students' reading comprehension of the first grade at SMAN 4 Kediri.