Writing is one of the important skills is difficult because in writing have some aspects must be attention, like vocabulary and grammatically. This research focused on the error analysis of compound words construction on students writing factual report text. It was aimed to know the types of error and the error occur on the compound word construction in writing factual report text. The research was conducted in a class of eleventh grade students in SMK PGRI 2 Sidoarjo. The researcher used describtive qualitative The data were collected through students’ writing. The data instrument from student’s task. The result of this research were 4 types of errors and 33 items errors in student’s writing . There were 6 items errors of addition with the precentages of 18%, 10 items errors of omission with the precentages 30%, 4 items errors of misformation with the precentage 12% and 13 items errors of misordering with the precentage 40%. Based on the finding, it reflected that the students made errors while producing their writing. For suggestion, the teacher and the students should learn more about English grammar, so the errors could be minimize. For further researcher, the researcher suggest that this research can be reference in writing the other research.