Coarctation of aorta is relatively rare disease in oriental region. Male is predominantly affected than female. There are three types according to location of the coarctation in relation to ductus arteriosus, preductal, juxtaductal and postductal type. The preductal type is frequently associated with another anomalies such as PDA, VSD, TGA, etc. and is life threatening condition which could not be survival more than 1 year. Another types are usually asymptomatic, if present, headache, palpitation, DOE, epistaxis, intermittent claudication etc. are chief complaint. The hypertension is present on upper part of body and pressure gradient between proximal and distal to coarctation is present. The diagnosis is relatively easy to make by means of history, symptoms, sign and angiogram. Surgical procedure consists of resection and end to end anastomosis, graft replacement, synthetic patch to widen a narrrowed segment [angioplastic procedure], wedge resection and Lt. subclavian-aortic anastomosis. During the period from 1978 to 1983, 4 cases of coarctation of aorta were experienced at Korea University Hospital. First case was 21 years old male who had postductal coarctation and was treated with coarctectomy with end to end anastomosis. Second case was 19 years old male who had juxtaductal coarctation with PDA and was treated with aortoplastic procedure. Fourth case was 37 years old male who had postductal diffuse coarctation and was treated with Dacron patch angioplastic procedure. All except one had relatively successful results.The unsuccessful one was treated with the procedure of aortoplasty as longitudinal incision followed with horizontal suture at the stenotic aorta.[KTCS 1983;1:102-107] Coarctation of aorta is relatively rare disease in oriental region. Male is predominantly affected than female. There are three types according to location of the coarctation in relation to ductus arteriosus, preductal, juxtaductal and postductal type. The preductal type is frequently associated with another anomalies such as PDA, VSD, TGA, etc. and is life threatening condition which could not be survival more than 1 year. Another types are usually asymptomatic, if present, headache, palpitation, DOE, epistaxis, intermittent claudication etc. are chief complaint. The hypertension is present on upper part of body and pressure gradient between proximal and distal to coarctation is present. The diagnosis is relatively easy to make by means of history, symptoms, sign and angiogram. Surgical procedure consists of resection and end to end anastomosis, graft replacement, synthetic patch to widen a narrrowed segment [angioplastic procedure], wedge resection and Lt. subclavian-aortic anastomosis. During the period from 1978 to 1983, 4 cases of coarctation of aorta were experienced at Korea University Hospital. First case was 21 years old male who had postductal coarctation and was treated with coarctectomy with end to end anastomosis. Second case was 19 years old male who had juxtaductal coarctation with PDA and was treated with aortoplastic procedure. Fourth case was 37 years old male who had postductal diffuse coarctation and was treated with Dacron patch angioplastic procedure. All except one had relatively successful results.The unsuccessful one was treated with the procedure of aortoplasty as longitudinal incision followed with horizontal suture at the stenotic aorta.[KTCS 1983;1:102-107]