The current study aimed at investigating the effectiveness of using a CoRT- based program in developing university students' creative writing skills. The targeted creative writing sub- skills were (fluency, flexibility, originality, and elaboration). The study utilized a one-group pre-posttest design in which data was collected to investigate the effectiveness of a CoRT-based program in developing English language creative writing skills in the light of constructivism theory for university students. Participants of the study received a training based on CoRT 2 in light of constructivism theory. Instruments designed and used in the study were a creative writing test and a rubric for scoring the students' creative writing performance. The treatment was conducted during the second semester of the academic year 2022- 2023. The results showed that there was a statistical significant difference between the mean score of the study group in the pre and post application of the creative writing test in favor of the posttest. The results indicated that The CoRT- based program developed students' EFL creative writing skills.