Penelitian ini bertujuan untuk mengetahui peningkatan penguasaan kosakata siswa setelah diajarkan melalui movies dan kesulitan siswa dalam penggunaan movies. Penelitian ini menggunakan desain one group pretest dan posttest. Tes kosakata dan interview digunakan untuk pengambilan data. Data ini di analisis menggunakan repeated measured T-test. Subyek penelitian ini 24 siswa dari kelas satu pada SMPN 26 Bandar Lampung. Hasil penelitian menunjukkan bahwa adanya peningkatan antara pretest dan posttest. Dengan level signifikan adalah p0.05 (p=0.000). Penemuan kedua mengungkapkan bahwa siswa merasa sulit untuk memahami kata-kata atau frasa yang sulit, pengucapan penutur aslinya dan tingkat kecepatan penutur aslinya. Meskipun siswa menemukan kesulitan, siswa mampu meningkatkan penguasaan kosakata.Dari hasil yang didapat, disimpulkan bahwa movies direkomendasikan untuk digunakan sebagai alternatif media dalam mengajar kosakata.The aims of the research were to find out the improvement of students vocabulary mastery after being taught through movies and the students difficulties to the implementation of movies. The research used one group pretest and posttest design. The vocabulary test and interview were used to collect the data. The datas were analyzed by using repeated measured T-test. The subjects of this study were 24 students from the first grade students of SMPN 26 Bandar Lampung. The result showed that there was a statistically significant improvement of the students mean score between the pretest and the posttest with significant level p0.05 (p=0.000). The second finding revealed that the students found it hard to understand the difficult words or phrases, the native speakers pronunciation, and the native speakers speed rate. Even though the students find difficulties, the students are able to improve their vocabulary mastery. This suggests that moviescan be used as an alternative media in teaching vocabulary.Key words: improve, movies, vocabulary mastery
                        
                        
                        
                        
                            
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