PURPOSE We investigated the treatment modality and clinical results in flexion-type supracondylar fractures of the humerus in children. MATERIALS AND METHODS 11 cases of flexion-type supracondylar fractures of the humerus(3 type I, 5 type II, 3 type III) were treated, 3 fractures(3 type I) with extension cast, 6 fractures(5 type II, 1 type III) with two lateral percutaneous K-wire fixation, 2 fractures(2 type III) with open reduction and crossed pin fixation. The K-wire were removed after 4-6 weeks of operation and the follow-up period ranged from 12 months to 26 months, averaging 18 months. RESULTS By Flynn 's functional and cosmetic criteria, nine cases were good and excellent results, one case (type III with two lateral percutaneous pin fixation) is fair result. CONCLUSION As the same methods of the extension-type supracondylar fractures, the K-wire fixation is useful method in the treatment of flexion-type supracondylar fractures of the humerus in children.