This research is motivated by the low ability to understand the mathematical concepts of student in fourth grade elementary school. Leraning only uses lecture and assigment methods without direcly involving students to find concepts from mathematical learning, and the learning is still abstract. This research aims to describe the application of Realistic Mathematic Education (RME) learning models to improve the ability to understand the mathematical concept of student in four grade elementary school. This research implemented the research method of action research class model Kemmis and Mc. Taggart. Research participants are fourth grades students in one ofthe state elemetary school in Bandung City. Data acquisition result are analyzed by qualitative and quantitative methods. After the implementation in two cycles, there has been an increase in understanding the mathematical concept of the student based on learning that is 30% in cycle I to 85% in cycles II. Realistic Mathematic Educaton learning model can improve the understanding of mathematical concepts of students in fourth grade.
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