Speaking skill is hard to be mastered by the students because of the lack of teachers' ability to improve students' speaking ability. Role play is also a technique that makes students work in pairs, supports one another and makes the class more interesting and reduces students’ boredom. This study tried to figure out the effect of role play technique to students in junior high school level in Indonesia as EFL learners who face various obstacles in learning and practicing speaking in English in order to look for a problem-solving of the difficulties found and a way to boost the students’ interest in learning this skill. A research design is essential as the guide to carry out the study because the right research design will help the researcher to obtain the good result in the study and avoid errors in the research process. In the current study, the researcher applied pre-experimental research or One-Group Pretest-Posttest design. This research only use one group as the experiment object and the tests were given before and after the treatment. The population of this research was 36 students of second grade in MTs Ma’arif NU Kota Malang and VIII B class with 10 students as the sample to observe by using cluster random sampling. The data obtained were calculated by using IBM SPSS 20 program. The result from SPSS and finding out if the data distribution is normal, and employed paired sample t-test to analyze the pretest and posttest of the participants. The paired sample t-test is designed in order to compare the means of both pre-test and post-test. Based on the research analysis, the result of t-value was more than t-table (5.056 >0.7646) which indicated a rejection of the null hypothesis. The sig (2-tailed) of the data was 0.001 which means that it less than α (0.01). Table 4.3 showed that 0.001<0.01, therefore the null hypothesis as mentioned in the chapter 1 (There is no effect of role play on the speaking ability of second grade students at MTs Ma’arif NU Malang) is rejected. So, it is clearly showed that role play technique full has a significant effect to improve the learners’ speaking ability.