English is a subject that need to learned by the students in the world, because in this era all of information and technology using English. But, the students have problem when they learn English especially students in Indonesia. They get problem in vocabulary. So they need improve their vocabulary. The research aims to improve vocabulary mastery of the third grade students of SDN Nambaan 1 Kediri. In this research, the researcher used Classroom Action Research that consists of one cycle. The subject of the research was the third grade students. The cycle consisted of two meetings. The cycle consisted of four steps; planning, acting, observating, and reflecting. The data were getting from the observation sheet, testing, and questionnaire. The test result showed the improvement of the students’ achievement before and after the action in cycle I. In cycle I, the students’ mean score in the test I was 70.2. In the test II the result had been optimal, it was 83.5. It showed that the score of students are higher than KKM ( criteria of success ) which is 75. Based on the result, it can concluded that the students’ achievement increase and the implementation of the research is success. So the researcher did not need to conduct cycle II. The action research findings showed that “ the use of animation video can improve the students’ vocabulary mastery”.

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