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The results of the teacher competency test based on the 2018 Program for International Student Assessment (PISA) survey, which placed Indonesia in 74th out of 79 had an impact on student achievement, especially in the field of mathematics. The ability of students is very lacking, especially in mathematical understanding, reasoning and problem solving abilities. Therefore, a teacher as the main designer in the learning process is required to be able to master learning theory and learning principles and be able to master and develop learning materials creatively. The principles and creative learning materials are known as realistic learning models. Therefore, the purpose of this study is to improve the competence of high school teachers (especially in East OKU district) in implementing realistic mathematics education (RME). This research method is divided into three stages, namely: First Stage: socialization in the form of lectures and discussions about RME material. The second stage: workshops/training/assistance in program preparation, and preparation of teaching materials using RME. The third stage: implementation of learning in schools, along with the monitoring system. The analysis concludes that this study has increased the professional competence of teachers in implementing realistic mathematics learning as indicated by the potential effect on student learning outcomes (the average score of students' abilities is 70.16) and the results of the analysis of observations of each activity during learning (average results). Average 3.09)

RME,Profesionalism Development