We compared the clinical and radiologic outcomes between broad DCP and narrow DCP for humeral shaft fractures requiring operative intervention. Authors analyzed 21 cases of the humeral shaft fracture in adults treated between May 1993 to August 1998. 12 patients were treated with broad DCP fixation, and 9 another patients were treated with narrow DCP fixation. Average follow-up time was two year and seven months( at least 2years). There was no difference in terms of average time to nuion in both groups(p>0.05). In the broad DCP group, clinical union was accomplished at 8.5weeks and the mean radiological union at 14.6weeks, while in narrow DCP group, the clinical union at 8.7weeks and the radiological union at 15.3weeks. In our study, narrow DCP fixation is preferred for the humeral shaft fracture requiring internal fixation, without wide soft tissue dissection.