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This research aimed to describe revlective abstraction viewed from each of part of reflective abstraction. The research question was about how the students-s revlective abstraction in projecting knowledge of existing mathematical concept . the research approach used was qualitative research approach with study case design as the research method. This research involved 36 eleven grade students. The data were analyzed qualitatively by using hyperRESEARCH application. The first part of students-s revlective abstraction could be seen from how the students developed concept of mathematical problem solving on the learning process in the classroom and on the mathematical problem testing, while the second part of the reflective abstraction could be seen on the process of developing core concept of mathematics learning