This study aimed to explore the impact of teachers’ commentary feedback on EFL learners' writing skill and writing anxiety. Moreover, it sought to provide a greater understanding of this effect on different elements of writing such as structure, vocabulary, and mechanics. The study adopted a quantitative research design, in which 60 participants were selected from a private language institute in Shiraz through convenience sampling. The results demonstrated that teachers’ corrective feedback assist students' writing ability. Besides, the results indicated that written corrective commentary feedback led to improvement of Iranian EFL learners’ writing performance in respect to elements of structure and vocabulary, but not that of mechanics. Moreover, this research declared that giving written corrective feedback can decrease the participants’ writing anxiety to a significant amount. The findings of the present study are of value to EFL teachers and learners who are involved in teaching and learning writing skill.