The study investigated the impact of the shadowing technique on the pronunciation skills of EFL students at Thai Nguyen University of Information and Communication Technology. Over six weeks, 27 freshmen participated in an action research project, using multiple audio files for shadowing practice and submitting regular voice recordings. Pre-tests and post-tests were conducted to measure the effectiveness of the technique, and post-intervention questionnaires gathered students' attitudes. The results showed that consistent shadowing practice significantly improved students' pronunciation.