In this part, the writer would like to explain about the Effectiveness of using picture books media towards students’ vocabulary mastery and to know and describe the average score of the students’ vocabulary mastery who learn through picture book media. The method of this research was conducted by using experimental method. The population of this research was the students at the first semester of the eighth grade at MTs Negeri 1 Bandar Lampung 357 students in 10 classes. In this research, the writer got VIII A as the experimental class there are 33 students and VIII B as the control class there are 33 students. Intaking the sample, the writer used random sampling technique. In collecting the data, the writer used multiple choice test to measure the students’ reading comprehension. Multiple choice or objective response is a form of an objective assessment in which respondents are asked to select only correct answers from the choices offered as a list.In analyzing the data, the writer used .After analyzing the data used formula. Based on the result, the writer found that average score of student’s reading comprehension in experimental class higher than control class (). It means that, Picture book media were successful to increase the students’ vocbulary mastery. Then, the writer also concluded there is significant influence of picture books media towards students’ vocabulary mastery at eighth class of MTs Negeri 1 Bandar Lampung. It was proved by the result of calculation by using formula that was higher than ttabel ( 3.75> 2.00 > 2.66). Therefore, picture book media is an effective strategy which can be used by the teacher to improve students’ vocabulary mastery.