The current mixed method study investigated the use of synchronous/asynchronous computer-mediated communication as a method of L2 pronunciation achievement among medical students during COVID-19 pandemic lockdown. In so doing, the study utilized an experimental comparative design with two groups of 17 participants. There were two types of tests in this study: word stress test, and a semi-structured interview. The results showed the positive effect of computer mediated communication in pronunciation development among students of medicine. Moreover, the findings revealed more positive effect of synchronous computer mediated communication-oriented instruction compared with asynchronous computer mediated communication-oriented instruction on medical students' English language pronunciation development. It can be concluded that computer mediated communication especially synchronous mode is effective for pronunciation development of medical students since technology provides the opportunities through which medical students can notice the gaps in their current English language and thus produce modified output. پرونده مقاله