Between December 1989 and january 1944, 17 corrective supracondylar osteotomy of humerus for cubitus varus and valgus were performed at department of orthopaedic surgery in Yeugnam University. Supracondylar fracture was the most common cause of deformity Average age at operation was 18.6 years old and average follow up period was 14 months. The operation was done under the comprehensive preoperative plan, and Internal fixation was done with K-w,res ,n younger patients, and with plates and screws in elder ones(77%). Period for external fixation could be shortened by firm internal fixation. The result was exllent in nine cases, good in four, and poor in four. No ulna and radial nerve palsy were found in operation of cubitus varus. There were three tardy ulna nerve palsy In cubitus valgus, then anterior transposition of ulna nerve was done.