The auricular defect is caused by trauma or infection, etc. It has its own characteristics compared to the tissue defect of congenital microtia, such as the local skin often has scars, and the blood supply, elasticity, and looseness are poor. It is not easy to form a wide and loose cavity that can accommodate the implanted stent tissue. Therefore, it is often difficult to clearly show the shape of the contour carved on the stent. However, even if the defect is severe, some of the ear nail and external auditory canal remain, making it easy to achieve a better shape of the reconstructed ear. The main causative factors are as follows: Trauma: Mechanical factors that cause the destruction of human tissues or organs. The analysis is based on the place of occurrence, the site of injury, the injured tissue, the causative factors and the integrity of the skin. Severe trauma can cause systemic reaction, local manifestations include pain, swelling and pressure pain in the injured area; deformity and dysfunction in case of fracture dislocation. Burns: Injuries caused by flame, high temperature solids and strong radiant heat are called burns. Burns are tissue damage caused by high temperatures, chemicals or electricity. The degree of burn injury varies by the temperature and the duration of action. Local variations can be classified into four degrees. An increase in the amount of lactic acid in the blood and a decrease in the pH of the arterial blood are seen in burns, and anoxemia (anemia) increases as the capillary dysfunction of the tissue worsens. Tumor resection: Tumor resection is performed after tumor disease in the ear, which can easily result in bilateral auricular defects. The repair of auricular defects can be done by referring to the basic principles of total auricular reconstruction, and by choosing suitable surgical methods and tissue grafts, taking into account the site, size and local tissue condition of the defect.