This study aims to find out the use of color pictures in increasing students' vocabulary mastery and to investigate students' perceptions of the use of color pictures. It was conducted in SMPN 1 Jaya, Lamno. This study used experimental research method. The population consisted of class VII students totaling 49 students. The samples taken by the researcher were 25 students from class VII -A and 24 students from class VII -C. Data were obtained through pre-test and 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 the pre-test and post-test obtained a significance level (2-tailed) of .000 < 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 an increase in students' vocabulary mastery after the researcher gave the treatment using color pictures to the students. Based on the questionnaire results, students' perceptions of the use of color pictures succeeded in attracting students' attention during the learning process and could facilitate students in understanding and
mastering new vocabulary.