Authors developed a new method of measuring spinal sagittal curve that is easy and and practical using the lower border of the vertebral body. The intersecting angle was defined as the angle formed bythe perpendicular line drawn from the lower margin of the upper vertebral body with the lower margin of the lower vertebral body which is nearer to the vertebral body. The segmental angle was defined as the intersecting angle minus 90 degrees. A positive segmental angle meant lordosis and negative segmental angle, kyphosis. Authors studied standing lateral thoracolumbosacral films of 80 back pain and deformity free Korean adults who visited Seoul National Universty Hospital during the period of Jan. 1988 to Jun. 1988 using this method to determine the normal segmental sagittal angle and the kypholordotic junction. With statistical analysis of the results, we came to following conclusions. l. Indivdual segments showed its typical sagittal angle. There was no age and sex difference in segments T10 to L5. 2. The gross lordosis of the lumbosacral spine from Ll to Sl showed no age and sex difference. But the Sl segment was more lordotic in males with no age difference. 3. The Ll segment was the kypholordotic junction which was in slight kyphosis 4. The normal ranges of sagittai ourve obtained in this experiment can be used as a guideline to contouring spinal internal fixation device in the sagittal plane.