Supracondylar and intercondylar fracture of the adult humerus is uncommon and present a difficult management problem. The purpose of this study is to analyse the clinical results according to types of the fracture and methods of the treatment. The authors reviewed twenty-eight patients treated for supracondylar and intercondlar fracture of the adult humerus at the Department of Orthopaedic Surgery, Korea University Hospital from January 1990 to August 1996. The mean follow up period was 41 months (12months to 79months). The results were as follows: 1. According to AO classification, there were 9 cases(32%) of Type A, and 19 cases(68%) of Type C. 2. The Methods of treatment were closed reduction and cast immobilization in 4 cases, closed reduction and fixation with K-wire or screw in 11 cases, open reduction and fixation with K-wire or screw in 7 cases and open reduction and plate fixation in 6 cases. 3. Poor results can be expected after closed reduction and cast immobilization, open fracture, above 60 years old, and Type C according to AO classification.