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The purpose of this study is to identify the characteristics of learning obstacles, especially epistemological obstacles in problem solving on the concept of triangles and squares. The research was conducted on junior high school students in one of the schools in the city of Mataram. The research sample consisted of 7 students with low level skills. The research instrument in the form of Respondents' Ability Test on triangular and rectangular material consisting of 5 questions, observation sheets and interview guidelines. Qualitative research methods are used with didactical design research approach. The results showed that students' learning obstacles at low level ability in the form of students are still weak in understanding the basic concepts of triangles and squares and the application of triangular and square formulas in the context of non -routine questions. These results confirm that the observation of learning obstacles as a basis for planning the development of learning experiences is the main thing. Understanding the characteristics of students is the key to student success in learning and problem solving.

learning obstacles; epistemological obstacles;