The common sites for measuring bone density are the lumbar spine, hip and forearm sites. By comparing these 3 sites, the site with the lowest value is taken as a reference, i.e., the value of bone density, and the value of each site serves as a reference for whether the site is prone to fracture or not. At the same time the measurement of bone density can monitor the efficacy of the drug, if only 1 site is monitored, if other parts of the fracture phenomenon, there is no reference significance. The amount of bone density and bone mass is different in different parts of the body, so monitoring several parts of the body is more conducive to the assessment of osteoporosis in the body. If the examination by the bone density decreased, may need to eat more calcium-containing food and vitamin D food, take some anti-osteoporosis drugs, such as sodium alenphosphate, can also be injected with salmon calcitonin, as well as more sunshine and outdoor exercise in general.