This study aims to investigate the effectiveness of segment chain activities in improving students' ability to write descriptive paragraphs and to identify challenges during the implementation. A quantitative experimental design was used, with a randomly selected experimental group (27 students) and control group (28 students). Due to some absences, only 19 students from each group attended the post-test. Data were collected through post-tests and a questionnaire, which aimed to explore the students‘ obstacles in writing descriptive paragraph. The results were analyzed using SPSS 26.0 and revealed a significant improvement in the experimental group, with a post-test mean score of 16.89 (SD = 2.76), compared to 8.47 (SD = 3.56) in the control group. The degrees of freedom (df) were 53, and the p-value was less than 0.05 (0.00 ˂ 0.05), indicating a significant difference between the groups. The study also identified challenges during implementation, but overall, segment chain activities were effective in enhancing students' writing skills. Therefore, the null hypothesis (H0) is rejected, and the alternative hypothesis (Ha) is accepted.