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As time goes up, structural capacity of members decreases in reinforced concrete structures. This deterioration is unavoidable, thus it is necessary to develop the method for repair & modification of structures in order to ensure structural safety of members. The purpose of this paper is to investigate the load-deflection, strength evaluation, failure mode, and energy absorption capacity of reinforced concrete columns strengthened with angle and bolt tension, and evaluate the degree of their strengthening effect. For the test, the specimen size of column is 20×20×90㎝ reinforced with 4 number of main bars of 13 mm diameter, tied bars of 6 mm diameter. The test results show that the increasement of bolt and bolt tension's quantity improve the ultimate strength and energy absorption capacity.