In 257 open fracture patients, treated from 1972 to 1979 at Kyung Hee University Hospital and analysed retrospectively, the infection rate was 35.8%. The factors thought to be associated with post-operative infection in open fracture were statistically analysed and discussed. The conclusions of this study were follows: 1. Open fractures require adequate debridement and irrigation. 2. Antibiotics should be administered as early as possible, especially before operation. 3. Early determination of local blood clrculation and its improvement are importent. 4. Contaminated open wound should be treated open, but if wound considered clean by adequate debridement may be closed primarlly. 5. If primary bone fixation is required, external flxation is recommended. Internal fixation should be avoided In grade I & II, but in grade III internal fixatlon is not contraindication for Improvement of blood circulation and open wound management.