Distraction osteogenesis for correction of skeletal relationship was introduced for lengthening legs by Ilizarov. And it is important to keep the Ilizarov principles for distraction osteogenesis. Distraction osteogenesis in midface area was recommendation treatment to reduce the treatment time and the side effects during orthodontic treatment. The patient's age, method of bone cutting, distraction rhythm, position of distraction device and consolidation period were consideration factors during distraction osteogenesis in midface area. In this article, we present a cases that were treated by using anterior segmental DO.