The forearm has the specific movement of supination and pronation. So, the goal of the treatment of fractures of the forearm both bones is recovery of the rotatory function of the forearm as well as the function fo elbow and wrist. Accurate anatomical reduction, rigid interanl fixation, the cooperation of patients and other factors affect the final results. The authors treated ninety two patients of the fractures of forearm both bones at the Kyungpook National University Hospital from January 1976 till December 1990, and analyzed them clinically. The results obtained were as follows: 1. Among 92 cases, 43 were belt and 49 cases were non-belt injuries. 2. The most common fracture site was middle one third. 3. All except 9 cases were treated by open reduction and internal fixation with plate in 58, and with Rush pins in 25 cases. Immobilization period was 8 weeks in plate and 14 weeks in Rush pin fixation. 4. Radiological bone union was achieved earlier in non-belt injuries fixed with compression plate, and delayed in belt injuries fixed with Rush pins to treat soft tissue damages.