this study was conducted to investigate the effect of favorite-text on iranian intermediate efl learners’ vocabulary development. sixty learners from nour-al-mahdi english institute participated in the present study. having been homogenized by oxford placement test (opt), they were randomly assigned into two groups of 30, control and experimental. then both groups sat for a pre-test which was a vocabulary test. the purpose of this test was to measure the learners’ initial knowledge of vocabulary. then a checklist was given to both groups in order to examine their areas of interest based on the topics presented in the list. afterwards, the experimental group received treatment on vocabulary based on their favorite-texts. however, the control group was taught vocabulary based on the traditional way of teaching. the treatment procedure lasted eight sessions. finally, at the end of the course, both groups sat for the post-test of vocabulary. then the statistical analysis was run through t-test. it was explored from the study that learners’ vocabulary knowledge will be improved through favorite-text. this study provides a significant contribution to curriculum innovation with respect to the learners’ vocabulary development.