3-Dimensional (3D) reformation of CT is more valuable in perception of the extent of major fracture lines and resulting displacement of fregments in cases of severe facial injury and complex injury in axial skeletion. From Aug. 1988 to Mar. 1989, authors experienced 8 cases of 3D reformation in nasal bone fractures and compared their findings with those of plain radiography or CT. As compared to plain radiography or CT, 3D reformation was diagnositically more useful in evaluation of extent of fracture, degree of depression, deviation and spatial relatioship, providing more accurate and rapid assimilation of above informations. But 3D was less useful in evaluation of detection of fractures, expecially those with multiple or shallow fracture lines.