The purpose of this research is to improve student activity, student concept understanding, and problem solving competencies on similirity trought realistic mathematic education. This research is applying on nineth E grade of MTs Negeri 2 Temanggung. This research is conducted on two cycles. Each cycle consisted of three meetings that first meeting the students presented a problem relating to similirity, at the second meeting the students facilatated students to construct the consept of similarity, at the third meeting the students served back a problem that aplication of similarity.Data obtained in this research is data activity of students in learning, the values of knowledge and skills. The data were analiyzed by using a description comparation techniques. The results of this research are active students in the first cycle of 69,4% increase to 94,4% in the second cycle, the understanding of similarity concept in first cycle of 76% increase 87% in the second cycle, and problem solving competencies on first and second cycle reach 68%.
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