There are three methods to measure bone age in clinic, one is ultrasound bone age test method, one is X-ray bone age test method and the last is CHN test method. However, the most commonly used clinical method for bone age measurement is to take a bone age film. The specific process of taking bone age films is: generally, X-rays of the hands and wrists are done or X-rays of the pelvis are done, and the usual method uses the counting method of the ossification center, and there are also calculation systems including the charting method, the scoring method, and the calculation of the bone age, and bone age measurement can be done as well. Bone age and the degree of development of the bones are determined by observing, specific images in the X-ray. It is important to take rest and exercise, and to increase the intake of calcium and vitamin D in general. If there is any discomfort, it is recommended to consult a doctor in time, improve the bone age related examination, clarify the cause of the disease and carry out targeted treatment under the guidance of a professional doctor, so as to avoid delaying the condition.