Academic writing is one of the most interesting and important topics for students to learn, especially for student who want to graduate because the final assignment requires students to master academic writing (Thaiss, 2006) to write a final paper or skripsi. As skripsi is mandatory for Indonesian undergraduate students, the problem of writing skripsi also occurs in a private university in Yogyakarta. Some students from the English department have not obtained their bachelor’s degree because they have not finished the final assignment that is writing skripsi. This research investigated deeper about the internal factors and external factors affecting students’ difficulties in writing skripsi. The methodology of this research used descriptive qualitative. Three participants were chosen by the criteria. The results showed that internal factors that face students in writing skripsi include psychological factor (motivation from them self) And the External factors are peer support, process of consultation, environment neighborhood, job or career and facility.