Most of the bone age measurement is to take X-ray film of the left wrist, a part of the X-ray flat film of the tertiary hospital, the charge is about 55 yuan, different regions, different levels of hospitals, the price will be slightly different, after taking flat film, through the observation of the left hand palm, phalanges, carpal bones, and the lower end of the ulna-radius bone ossification center of the degree of development, so as to determine the age of the bone, is the clinically more practical determination of the age of the bone, the accuracy is relatively high, no trauma, can be more objective response to the development of children, predict the child’s development potential, height, and sexual maturity. It is a practical clinical measurement of bone age that is highly accurate, non-traumatic, and can objectively reflect the development of children and predict their developmental potential, height, and sexual maturity. For patients with abnormal bone age, regular examination of bone age can be targeted to select the use of medication, treatment of growth retardation, early detection, timely intervention with medication, in order to buy time for treatment.