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This study aimed to improve the ability of the understanding of semigroup concept through Concept Attainment Model. The method of this study was quasi experiment. The design of this study used one group pretest posttest design. The sample of the study was 34 students of the Study Program of Mathematics Education at Teacher Training and Education Faculty, Universitas Bengkulu at the subject of Abstract Algebra of Even Semester Academic Year 2018-2019. The instrument used in this study was a test about semigroup concept containing 4 items. The data was analyzed qualitatively and quantitatively. The results of this study were: 1) the improvement of the students- ability of the understanding of semigroup concept was 0.68, including the medium category; 2) the achievement of the ability of the understanding of semigroup concept was 75.44, including the high category.