The authors analysed the 40 patients of the lateral condyle fracture of the humerus in children who were admitted in Korea Veterans Hospital in Seoul from Jan. 1990 to Dec. 1997. The fracture type and the displacement was classified according to Milch type and Jakob stage. Clinical analysis was performed on 40 patients with lateral condyle fracture of humerus, who could be followed up. The patients were followed up from 12 months to 63 months with an average of 23 months. Average duration of bone union was 6 weeks after operation. The significant differences in outcome were notified from open reduction and internal fixation in comparison to closed reduction and percutaneous pinning. According to the criteria of Hardacre, we obtained excellent result in 16 cases(40%), good result in 22 cases(55%) and poor results in 2 cases(5%).