This study aims to describe the learning barriers experienced by students in material around square. This study uses qualitative method, with data collection used the form of interviews, observations, and instrument test questions as many 5 questions that have been validated by experts. The research subjects were 7 students and 1 fourth grade teacher at SDN 1 Sindangrasa. Creating an optimal learning process does not only focus on mastering the material possessed by the teacher, however, it must also attention to learning barriers experienced by students, students are able to understand the material as a whole. Based on the results the study, students experienced 4 types learning obstacles in the rectangular perimeter material, learning obstacle type 1 related to students' difficulties in understanding the concept of flat square shape, learning obstacle type 2 related to students' lack of understanding in the concept of the square circumference formula, type 3 learning obstacle student difficulties perimeter of square, learning obstacle type 4 students' incomprehension in completing stories related the perimeter of the square. There are 3 factors cause students experience learning barriers including ontogenic barriers (students' readiness to learn), didactic barriers (teachers' didactic aspects) and epistemological barriers (student knowledge has limited context).