The study is aimed to investigate the internal and external problems in Writing by the Senior High Students in one of the school in Simalungun SMA Negeri 2 Bandar. The sample of this study is the eleventh grade students having low ability in Writing. This research is a qualitative study using purposive sample. In collecting the qualitative data the researchers did observation, and distributed questionnaire. This study reveals some findings related to the students’ low ability in writing.