As more and more doctors enter the ranks of jaw surgery, it indicates the growing technical strength of Chinese plastic surgery, but also brings uneven skills and aesthetic standard deviations resulting in later repair problems. The increasing number of jaw bone repair problems, I personally summed up, jaw margin defect than jaw angle excision too much need to repair the amount of cases, jaw margin defect refers to the chin (chin) and the jaw angle between the crater-shaped defect. This is also commonly known as a “pectus excavatum” osteotomy. The causes of jaw margin defects are mostly related to the surgeon’s position in front of the jaw angle, and there are several reasons for this: 1. 2, the problem of surgical vision, some doctors are not unaware of the purpose of surgery, some objective reasons such as novice often difficult to judge the exact location of the jaw angle. In particular, some patients have an involute mandibular angle, and the surgeon is unable to see the position of the mandibular angle directly, while fearing too much bone removal, so the position of bone removal is in the front. 3. The posterior bone growth of the mandibular angle after surgery will also aggravate the visual effect of the “pit-like” defect of the mandibular margin. In conclusion, it is especially important to accurately locate the bone resection position during surgery. If the field of vision is not clear, repeatedly use the stomatoscope to observe carefully, and try to make a successful repair in one go. Restoration methods and strategies Without damaging the mandibular nerve canal, the bone block is removed smoothly along the pit of the mandibular margin, forward and backward to obtain a smooth line of the mandibular margin.