This study aims to identify learning barriers experienced by junior high school students in understanding algebraic concepts and analyze how these barriers affect students' ability to solve number pattern problems. Indicators of epistemological barriers in the study are barriers to understanding concepts, barriers in applying procedures and barriers in operations. This type of research uses a qualitative approach with a case study type of research. This research was conducted at SMPN 3 Labuapi in the 2023/2024 school year. The instruments used in this study were descriptive test questions, interviews and documentation on students of class VIII-A SMPN 3 Labuapi. The subjects in this study were 6 students of class VIII-A SMPN 3 Labuapi. The instrument used in this research is a description test question as many as two questions and conducting interviews with each subject. Interviews were conducted to find out student obstacles in algebraic reasoning on number pattern material. The results of the analysis show that there is an epistemological obstacle in the 1 students of SMPN 3 Labuapi, namely errors in determining formulas, theorems or definitions and also errors in calculating values and the steps for solving number pattern problems that are ordered are not appropriate and errors in writing formulas that cause errors in calcu[i]lations. And the results of this study show that there are still many students experience epistemological barriers in the conceptual barriers section, procedural barriers and operational technique barriers.
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