Spatial ability is about mentally manipulating things and their components and is considered critical for different domains such as science, technology, engineering, and mathematics, it was also can understand the relation and nature of geometry to solve mathematical problems in everyday life. This study aims to design teaching materials in the form of pop up books based on Realistic Mathematics Education (RME) to improve students' spatial ability in three-dimensional material. This type of research is the development research R&D (Research and Development) with the ADDIE model. This study discusses the design stage. The subjects of this study were teachers and students of eight-grade of Muhammadiyah Boarding School (MBS) Pleret Yogyakarta. The research data was obtained by interviewing to describe students' needs, and learning information used, as well as document analysis to analyze curriculum, learning materials, and teaching materials. Data analysis techniques use qualitative analy.....

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