Osteoporosis is the metabolic bone disease and the bone is easily fracture by minimal stress due to decreased bone mass. It gets to attract more and more interest due to surprisingly high incidence and prevalence as well as its complications, fracture. We compared the bone mineral density between 45 osteoporotic patients group with compression fractures of the spine, 105 osteoporotic patients group without fractures and 45 normal control group using dual energy X-ray absorptiometry. We obtained following results. 1. There are statistically no significant differences between bone mineral density of the osteoporotic group with compression fracture of the spine and bone mineral density of the osteoporotic group without fractures. 2. Height and weight had statistically significant correlation with bone mineral density of the lumbar spine anteroposterior view, lateral view and Ward triangle. 3. Fracture threshold of the lumbar spine anteroposterior view, lateral wiew and Ward triangle are 0.884g/cm2, 0.694g/cm2 and 0.514g/cm2 according to 90percentile, 0.979g/cm2, 0.732g/cm2, 0.545g/cm2 according to 95percentile.