Abstrak
This research was conducted because the researcher found problems that were faced by the students at seventh grade of SMP N 7 Bukittinggi in English learning process. The phenomenon was the students were difficult to write the spelling the new words. Then, students were lack of vocabulary. The last, the teacher used conventional method. Theoritically there were many models that could be used by the teacher to help their students to improve students’ vocabulary mastery. One of them is Picture Word Inductive Model (PWIM). This statement made the researcher became interested to conduct the research at SMP N 7 Bukittinggi that aimed to know wheter there was significant effect of using Picture Word Inductive Model (PWIM) model towards vocabulary mastery at SMP N 7 Bukittinggi This research was an experimental research. The total of population was 4 classes. The researcher used Purposive Sampling Technique in choosing the sample. So, there were only one experimental class (VII1) and control class (VII2). To analyze the data of experimental class and control class, the researcher used the normality by using Lilliefors test and the homogeneity test by using F-test result and to test the hypothesis the researcher used t-test formula and consulted the result into ttable with level of significant α=0.05. The findings in this research show that three hypothesis (Ha) were accepted. The first is from the result of accounting the pre-test and the posts-test scores of the experimental class was found that the tobtained (13.419) was higher than the ttable (1.69552). So, the alternative hypothesis (Ha) was accepted where there was effect of Picture Word Inductive Model toward vocabulary mastery. The second is the calculation of the post-test of the both classes were calculation that the tobtained (11.13) was higher than the ttable (1.69552). Thus, the alternative hypothesis (Ha) was accepted where there is a significant difference between Picture Word Inductive Model and conventional technique. The last is the calculation of the post-test of the both classes were calculated that the tobtained (11.13) was higher than the ttable (1.69552). It was also found that the students’ using Picture Word Inductive Model (PWIM) is better than the students using conventional technique. It means that using Picture Word Inductive (PWIM) in teaching English gives significant effect toward students’ vocabulary mastery