This research aimed at investigating the effect of using PAVE strategy and motivation on students' vocabulary mastery. The design of this research was quasi-experimental research with 2x2 factorial designs. The population of this research was grade VIII students in junior high school 1 Batusangkar, West Sumatera, 2019/2020 academic year, amounting to 180 students consisting of 6 classes. There were two classes selected as experimental class and control class. The vocabulary mastery test and motivation questionnaire were used as instrumentation. Then the research data was processed using t-test formula and two-ways Anova. The results showed that (1) PAVE provided the significant effect in students' vocabulary mastery, (2) Pave provided the significant effect in students' vocabulary mastery with high motivation, (3) Pave didn't provide the significant effect in students' vocabulary mastery with low motivation, (4) there was an interaction between strategies and motivation on students' vocabulary mastery. Thus, the result shows that the PAVE provides better result to develop students' vocabulary mastery and motivation. The study recommended that the use of vocabulary learning strategies should be given enough attention to develop students' vocabulary and motivation.
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