Bima is one of the region located at West Nusa Tenggara, Indonesia. This tribe has many well-known folk stories between their people that can be considered as learning materials to teach reading comprehension in EFL class. Folktales can be one of the best choices of literary work for teaching reading comprehension, because folktales are acknowledged familiar in which students already have the spoken language of them from the parents or the grandparents rather than the written language. The previous studies showed that folktales is effective to teach reading comprehension, it enhance reading comprehension achievement of students. However, how effective Bima folktales as learning materials to teach reading comprehension especially at the level senior high school’s students should be investigated because there is no study about it before. Being designed in true experimental with post-test only control group, the objective of this study is to find out whether using of Bima folktales as learning materials is effective or not to teach reading comprehension on high school‘s students. These two groups were proved on the same level of reading comprehension ability by the scores of mid-term test. It is conducted on tenth grade students of IPA at SMA Negeri 2 which consists of 62 students who were able to participate. They were divided into 31 students as experimental group and 31 students as control group. In this study, the experimental group was given post-test after treatment finished and the control group also did post-test without the treatment. To achieve the purpose of this study, the post-tests scores then being analyzed using independent t-test in SPSS 20.0 version for windows. Based on independent t-test in SPSS 20.0 version for windows calculation, it was proved that the significant values of variances assumed was .097. It is indicated that the students’ reading comprehension achievement of experimental group and control group were homogenous. Meanwhile, sig. (2-tailed) value was .005 which less than .050 and it means that the H0 is rejected and H1 is accepted. Therefore, students of experimental group were proved have better achievement than the control group. It can be concluded that using Bima folktales is affective to teaching reading comprehension skill on tenth grade students of IPA at SMA Negeri 2. Suggestions purposed for further researchers to conduct the study with the related topic by providing more learning materials about Bima folktales. Because the time limited during Covid-19, the next researcher also could add more times for treatments, choosing more samples and preparing the test items more than the available items in order to have back up items if there are many difficulty items than the moderate items or if there are items deleted