According to different facial conditions and asymmetry, different methods can be taken to improve it. TOP. 1, the midline of the face is crooked, with mandibular inversion and long face. The most common situation is that the two sides of the face are asymmetrical and the midline of the face is crooked. Asymmetry needs to be corrected by bimaxillary surgery, and the situation of long face with opposite jaw can also be treated at the same time. TOP.2. Oral process and mandibular atrophy are accompanied by facial asymmetry, and the development of one or both jaws declines, resulting in asymmetry. It is necessary to perform bimaxillary surgery to improve mandibular protrusion and lateral process and treat asymmetry at the same time. TOP.3. In the case of asymmetrical face with large and wide mandible, the midline and mandibular line are asymmetrical. At the same time, mandibular angle surgery or V-ray surgery is needed to solve the problem of asymmetry of jaw line. The width of the chin can be minimized to achieve the cosmetic effect. TOP.4. In the case that the mandibular contour is inconsistent from left to right, the shape of the midline jaw is not crooked, and the lines of the mandibles on both sides are asymmetrical.