Abstract-The present research examined the role of written corrective feedback (WCF) in enhancing writing accuracy of Iranian Intermediate learners. The present study is quantitative and experimental survey that measured the accuracy of using two functions of English article system, namely definite article "the" and indefinite article "a" and "an" during eight weeks using pre-test and post-test. Sixty students including (20 control group, 20 experimental group,20 experimental group) participated in the study to determine which kind of teacher written corrective feedback affects writing accuracy more. (1) Control group did not receive WCF on specific grammar errors; group (2) received direct WCF; group (3) received indirect WCF. The results of the study demonstrated that direct (WCF) affected students' performance more.