The better methods of jaw plastic surgery are: extraoral incision: make a 3-5 cm incision at the mandibular angle and remove the mandibular angle. The operation is safer under direct vision. Masticatory muscles can be partially cut at the same time, and the technical content is not high. Incision behind the ear: make a 3-4 cm incision behind the ear to remove the mandibular angle. Its incision is relatively hidden and the operation is relatively simple.