The intellectual mild on mild intelectual disability students causes students to become less in their environmental and academic response. Mild intelectual disability students have difficulty in remembering a name or form. This study aims to determine the value in the students can before and after using the media geoboard and know-how big influence of geoboard media to understanding the geometric concept. This research method used Pre-experimental One Group Pretest-posttest. The subjects of this study were students of mild intelectual disability in SLB PGRI Dlanggu Mojokerto, which amounted to 5 students. Data were collected by using written test method before treatment and after treatment with the same problem. There is a comparative value of pretest average and posttest average of 54%. So the conclusion of this research "There is a significant influence of geoboard media on the understanding of the geometric concept of students with mild intelectual disability SLB PGRI Dlanggu Mojokerto". Keywords: Geoboard Media, Flat Awakening Concept, Mild Mental Retardation
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