Struggling students often face a huge quantity of new vocabulary when learning a language, but they might benefit from using the shadowing method. Imitating spoken language helps students acquire new words more efficiently and boosts their self-assurance in their ability to speak, pronounce, and comprehend words. This study aimed at finding out the use of shadowing method in improving students' vocabulary mastery and to investigate students' perceptions of the use of shadowing method. It was conducted in SMPN 1 Bakongan, South Aceh. This study used experimental research method. The population consisted of class VII students totaling 42 students. The samples taken by the researcher were 20 students from class VII -1 and 22 students from class VII -2. Data were obtained through post-test to determine the accurate results of students and questionnaires as reinforcement of research results to see students' perceptions. Data were analyzed using "SPSS 25" and questionnaire. The results of both post-tests obtained a significance level (2-tailed) of .001 < 0.05 after the independent test indicating that the alternative hypothesis (Ha) was acceptable and the null hypothesis (Ho) was rejected. The results of this study showed that there was improvement in students' vocabulary mastery after the researcher gave the treatment using shadowing method to the students. Based on the questionnaire results, students' perceptions of the use of shadowing method succeeded in making students more confidence in using new vocabulary in the learning process and facilitate students in understanding and mastering new vocabulary