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.