Congenital microtia is caused by abnormal development in the embryonic period, the auricle is severely underdeveloped, there is no normal auricle marking form, only contracture, deformed small cartilage mass and ectopic earlobes are seen in the ear area, the incidence rate of our country is about 1:6,000, and it needs to be treated by reconstructing the external auricle, and the surgery usually takes 2-3 times. Parents want their children to have a normal ear earlier, but in order to reconstruct the ear with realistic appearance, and not to bring great influence on the child’s mental health and schooling, the timing of the surgery is very critical, so when is the best time to operate? A large number of clinical studies have found that children with microtia can be operated when they are about 6 weeks old, because the size of the ear at this age is already close to that of an adult, and is only a little bit smaller than that of the patient’s adult ear, and the reconstruction of the ear can be done with a bracket that is slightly bigger than that of a normal ear at the age of 6, and the operation at this time has little impact on the child’s psychology and schooling. However, age is not the only factor in choosing the timing of surgery, as the reconstruction of the auricle needs to take its own rib cartilage, generally the child’s height reaches 1.2 meters, the size and strength of the rib cartilage can meet the needs of the operation, the child is too small, the amount of each rib cartilage will be less, and it may be necessary to take one more cartilage, therefore, the timing of the surgery for the reconstruction of the auricle of the microtia not only should be at the age of 6 years old, but also at the age of 1.2 meters tall. 1.2 meters. It is also best to complete the reconstruction before puberty, when the rib cartilage often becomes “hollow” due to the rapid growth of the body, which interferes with the sculpting of the auricular scaffolding. Although it is possible to create beautiful ears in adulthood, the rib cartilage gradually calcifies, hardens, and becomes brittle in adulthood, making the surgery difficult and even affecting the results. Generally, after the age of 25, men’s cartilage will be calcified and not suitable for ear reconstruction, while women’s cartilage will be calcified earlier, so it is better for women to have ear reconstruction before the age of 23.