Fracture of frontal bone is infrequent, but may have serious complications because of their proximity to the brain, eyes and noses. Fractures of the frontal area range from 5% to 15% of all facial bone fracture and include supraorbital rim and frontal sinus. As frontal bone fractures most frequently occur in the multiply injured patient, a thorough clinical and radiological examination of the patient is required before diagnosis and treatment plans are established. Sometimes coorperative treatment with other department is required. It is specially considered that incision for access to frontal region and surgical methods for open reduction, cranialization, cannulization, sinus obliteration. After surgical or conservative treatment, it may have complication. Complication of frontal bone injury vary in severity and may occur at several years after the incidents. The major types of complications are those that occur directly at the time of injury, infection and chronic problems. This is clinical study on 31 patients with frontal bone fracture, at department of oral and maxillofacial surgery in dental hospital of Wonkwang university during past ten years. The results were as follows; 1. The sex ratio of all patients is 29 (94%) male to 2 (6%) female, the average age is 33 and the prominent groups are 2nd, 3rd decade age. 2. The causative factors are mostly traffic accident 22 cases (70%) and fall dawn, industrial accidents, so on. 3. The 17 cases has shown alert mental status, but neurologic problems is in 14 (45%) cases in initial accessment. 4. Associated facial bone fractures are prominent in the maxilla (42%) and panfacial fracture (39%). 5. Involved general problems are in department of neurologic surgery problems (65%), orthopaedic problems (23%) and ophthalmologic problems (19%) in order. 6. Open reduction has done in 15 cases and 16 cases with conservative management. 7. Postoperative complications are chronic headache (42%), esthetic problems (39%) and ophthalmologic problems (35%)in order.