There encountered 28 cases of fractures of the humeral shaft at the Orthopedic Department of the Third Army Hospital from April, 1968 to June, 1969. These were analized and following observations were made: 1. There were 10 cases (35.7%) of gun-shot wound and another 10 cases (35.7%) of traffic accident. Eight cases were due to other causes. 2. Four fractures involved the upper one third of the shaft, 16 the middle one third and the remaining eight the lower one third. 3. 11 fractures were transverse and eight oblique. Another eight fractures were comminuted and the remaining one was a butterfly fracture. 4. Closed reduction was performed on 22 cases (78.6%) and open reduction on six (21.4%). The former includes 20 cases (71.4%) of hanging cast. 5. Of the fractures treated closed, seven were united in six weeks, ten in eight weeks, and five in more than ten weeks. 6. High radial nerve palsy was observed in six cases (21.4%); 4 of them occurred in fracturcs of the middle third of the shaft. 7. Angulation deformities from malunion appeared to have little interference with joint motion.