The objective of this research is to find out the most difficult aspect and the factor of causing the students’ difficulties in comprehending analytical exposition texts at the second-grade of SMA NU 1 Hasyim Asy’ari Tarub – Tegal in academic year 2019/2020. This research is descriptive qualitative. The subject of research is the second-grade of XI IPA 1 at SMA NU 1 Hasyim Asy’ari Tarub – Tegal in the academic year 2019/2020. The techniques of collecting data are documentation and interview. The result of this research shows that there are 53.03% of students have less level in understanding to look for determining main idea of the text. Then, there are 66.67% students who have the less level of understanding to look for making inference of the text. Next, there are 75.76 % of students have an average level in locating the reference of the text. The last, there are 89.39 % of students who have a good level in detail information of the text. The difficulties faced by the students found in comprehending analytical exposition text, there are inadequate instruction, lack of pupil interest, and vocabulary difficulties. The factor of causing the students’ difficulties found in comprehending analytical exposition text, there is difficulty in understanding a long sentence, difficulty in reading strategy, and difficulty in concentration (school environment and home environment).