We meet much difficult problem to solve in the treatment of the forearm fractures which are not encountered in the treatment of fractures of the other long bone and there are many reports on the results of treatment of forearm fractures and many methods have been introduced. In the late 1950's ASIF compression plate was invented and developed by Muller, Allgower, and Willenegger and it has shown excellent union rate and functional results in the treatment of forearm fractures. From Jan. 1971 to Dec. 1979, we have experienced 71 cases of fresh or old forearm fractures treated by different methods and devices and among them, 53 patients, those were treated with compression plate and other various internal fixation devices, were possible to trace for more than 3 months. The Author divided the traceable patients into two groups, the one was the group treated with compression plate and the othtr one was the group treated with other various internal fixations, and compared the results in the aspect of healing time and functional results. The results were as follows; 1. Among 71 patients, 45 patients (36.6%) were fresh and 26 were old cases. Of 61 adult patients 21 cases (34.4%) exhibited severe soft tissue injury due to crushing machinary injury. 2. There was 24 (33.8%) cases of open fractures and the most common fracture site was middle one-third of both radius and ulna. 3. The period between operation and exercise was 7.3 weeks in fresh cases which were treated with compression-plate fixation and 10.3 weeks in old cases with other fixation devices. 4. The time of radlological union was comparatively rapid in compression-plate fixation group, acute cases and radial fractures when compared it with those treated with other fixation devices, old cases and ulnar fractures, respectively. Radiological union time in average was as follows; Radius, compression-plate fixation: 12.1 weeks ulna, compression-plate fixation: 12.4 weeks redius, other fixation devices 14.9 weeks ulna, other fixation devices 15.5 weeks 5. By Anderson's functional criteria, the ratio of excellent or good results was as follows, Acute compression-plate fixation: 87% Acute, other fixation devices 67% Old, Compression-plate flxation: 67% Old, Other fixation devices 23% 6. Achieved bony union in all cases in compression-plate fixation group and experienced 3 cases of non-union in the group treated with other fixation devices. Among 3, two cases of non-union were due to post-operative infection and technical failure and the other one was a solitary ulnar fracture which was treated with rush pin.