The present study aimed to investigate the effect of CA- based vs. EA- based error correction on the improvement of the EFL intermediate learners’ Lexical Errors of writing. Forty intermediate students, all males, studying in an English Language Institute in Golpayegan participated in this study. After detecting the participants’ errors, the lexical errors were classified into two categories, EA- based and CA-based errors. The errors which were because of the infuence of L1 on L2 were classified as CA-based errors and the errors which were because of the lack of target language proficiency were classified as EA-based errors. Then, the Wilcoxon Test was used to investigate the effect and the improvement of learners’ lexical errors by EA-based and CA-based error correction. The results of the study showed that there is no significant difference between EA-based and CA- based error correction in the improvement of the participants’ lexical errors.