This research study is aimed at improving the vocabulary mastery of the A grade students of RA. Zaid Bin Tsabit Jepara through the use of mind mapping. To limit the aspects to be analyzed in this study, the researcher formulates three research questions: (1) what the problems faced by the students?, (2) How is mind mapping strategy implemented to teach vocabulary for young learners (3) What are the strengths and weaknesses of implementation of mind mapping in teaching vocabulary for young learners?, The study was a case study research. The instruments for collecting the data were observation guides, interview guides and documentations. The data were in the form of field notes, interview transcripts, and all the documentation. Interview was used to know what the students’ problem in learning vocabulary. Then, observation was used to know the teacher implement the mind mapping strategy in the class and documentation was used to help the researcher completed the data becomes valid data. The findings of the data analyses show that (1) Mind mapping can help the teacher to present vocabulary items; (2) Mind mapping can help the students to memorize English vocabulary items; (3) Mind mapping can make the students enjoyable in learning process (4) Aspects in mind mapping such as imagination and association can help the students understand the words and memorize them in a short time; (5) The kind of the activities given such as conveying expressions, describing pictures, drawing pictures based on the texts, etc. can explore the use of vocabulary items learned in the classroom.