First, the incision behind the ear: make a 3-4 cm incision behind the ear to remove the mandibular angle. Advantages: The incision is relatively hidden and the operation is relatively complicated. Second, extraoral incision: make a 3-5 cm incision at the mandibular angle to remove the mandibular angle. Advantages: Mandibular angle plastic surgery is performed under direct vision, without complicated equipment and instruments, and the tasting muscles can be cut off at the same time. Third, submandibular micro-incision: that is, using the incision separated inside and outside the mouth, insert a large incision of 0.5 cm ~ 0.8 cm with a chainsaw to complete all the operations of mandibular angle plastic surgery. The incision is above the mandible, and the incision will not be obvious after 36 months. Four. Incision separation inside and outside the mouth: it is very convenient to make a 3 cm ~ 4 cm incision in the mouth and two 0.5 cm ~ 0.8 cm incisions under the mandible to remove the hypertrophic mandibular angle. At the same time, the mandibular outer plate and mandibular margin can be removed or ground, and part of the masseter muscle can be removed. 5. Long curve mandibular angle shaping: it is the best mandibular angle shaping method today. Six, a complete intraoral incision: the use of 3 cm ~ 4 cm incision in the oral cavity, cut off the hypertrophy of the mandibular angle, at the same time can cut off or grind the mandibular outer plate and mandibular margin, can cut off part of the masseter muscle.