Supracondylar fracfture of the humerus is the most common fracture about the elbow joint in children. Early accurate reduction is very important to obtain good results. The authors reviewed 44 cases of supracondylar fractures treated at Inje Universsity Pusan Paik Hospital from January 1986 to December 1990. Average follow-up time was 1 year 6 months. The results were as follows; 1. Thirty cases were treated with closed reduction and percutaneous pinning, ten with manipulation and cast immobilization, three with skeletal traction and the rest one with open reduction and internal fixation. 2. If there was a difference of the angle within 10-degree in post-reduction X-ray, deformity did not follow at the last follow-up. 3. The common formula was that a change of 5-degree in Baumann's angle corresponded to a 2- degree change in the clinical carrying angle. 4. Baumann's angle did not change between that of initially accepted and that of the final follow up X-ray. So, the authors recommend post-reduction measurements of the Baumann's angle as the adequancy of reduction of supracondylar fractures in children.