This research is about error analysis of grammatical error in writing narrative text at the eight grade students of junior high school 04 Kotabumi academic year 2021/2022. The objectives of this research were to investigate about the types of students error found in writing narrative text and to investigate the most dominant error found of students' in writing narrative text at the eight grade students of junior high school 04 Kotabumi. The instrument of the research was test data. The research methodology was descriptive qualitative. The subjects of the study were the eight grade students of SMPN 04 Kotabumi. The data were collected from students narrative writing, and interview. The result of this research showed that there are four types of errors that occur; they are error of ommission, error of addition, error of misformation and error of misordering. From the data analysis the researcher found that the most dominant error that is error of misformation with total 116 errors. Error of misformation relates to the use of the wrong form of the morpheme or structure. This was because of the students' lack of knowledge in grammatical writing skill. Error of omission relates to the absence of an item that must appear in a well-formed utterance. Error of addition relates to the presence of an item that must not appear in well-formed utterances. Error of misordering relates to the incorrect placement of a morpheme or group of morphemes in an utterance. Therefore, this present study suggests that the English teachers will often make correction and provide further explanation and also feedback on students' grammatical error during the learning process.