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Abstract. Student-s understanding is an important part of educational goals. The purpose of this research is to identify student-s understanding in the material elasticity and harmonic oscillation in the inquiry-based physics learning. The subject of this research is all of the students in X IPA 4 SMA N Sambungmacan Sragen. The amount of this research subject is thirty students. The method used in this research is descriptive qualitative. The data on this research acquired with the students cognitive tests. The results of this research show that student-s understanding in elasticity, Hooke law, spring arrangement, modulus elasticity, and harmonic oscillation. The results were divided into three categories which are high, low, and average score.