Lesson Study for Learning Community (LSLC) is one of the efforts that can be done to improve teacher learning abilities. LSLC is an activity that can solve problems faced by teachers by applying various methods or appropriate learning strategies according to the demands of the 2013 curriculum and 21st century skills. PMRI of Indonesian Realistic Mathematics Education is a learning approach that is associated with real things or real situations that have been experienced by students so that the role of PMRI strongly supports the implementation of LSLC. The method used is descriptive qualitative research. While data collection is done by observation, documentation, field notes, and lesson plan and students' worksheet. This research was conducted on eleventh grade students at a state secondary school in South Sumatra Indonesia with the subject matter of three dimensions. There are four stages of LSLC; Plan, Do, See, and Re-design, and the teacher designs the lesson plans and worksheets based on PMRI. The media used is student worksheet. The results of this study indicate that learning with the application of PMRI-based LSLC can help students understand the concept of three-dimensional material, can build good collegiality between mathematics teachers, can solve problems faced by teachers, implementation of learning is in favor of students, and teachers gain experience about learning with PMRI based LSLC.