Benign hypertrophy of masseter mandibular angle is a common facial deformity in the East. This kind of person's face is often the shape of "wind" and "use". The subsurface 1/3 is obviously wider. In severe cases, the mandibular angle protrudes backward and downward, and some of them are accompanied by mandibular shortening 1/3. When the patient bites, he can see or touch the masticatory muscles that are obviously hypertrophy and uplift. Most cases are bilateral, and a few cases are unilateral. Bilateral asymmetry is also common, while unilateral asymmetry is very obvious. Most patients have no obvious discomfort. A few patients have local pain when chewing or are accompanied by different degrees of mouth opening limitation. According to the appearance, it can be divided into four types: 1. When grinding teeth, you can see and touch the hypertrophy of masticatory muscles; 2. Hypertrophic masticatory muscles can also be seen at rest; 3. Masticatory muscle hypertrophy with prominent mandibular angle; 4. Masticatory muscle hypertrophy, mandibular angle protrusion with Angle Class II malocclusion. Since Korean film and television stars achieved magical results by narrowing the mandibular angle, mandibular angle plastic surgery has also set off a craze in China, and they have asked for plastic surgery according to the Korean model. Looking at the development track of mandibular angle plastic surgery, it has a history of more than 100 years. 1880, Legg first reported the phenomenon of masticatory muscle hypertrophy. 1947, Curney was the first person to treat mandibular angle masticatory muscle hypertrophy by surgery, but he used an external incision, which may damage the facial nerve and leave scars. 195 1 year, converse completed the resection of the mandibular angle hypertrophy bone and masseter muscle by oral incision, and achieved good results. Since then, the method of contour modification (mandibular angle hypertrophy plastic surgery) has been continuously improved. Baek repaired mandibular angle protrusion by arc incision in mouth. This operation has a good effect on kyphosis and ectropion of mandibular angle, which conforms to the aesthetic standards of orientals. Later, Baek improved the operation, trimmed the prominent mandibular angle, thinned the thickened bone into an arc, and the operation effect was further improved. Zhang Xien 1992 used arc incision to remove the hyperplastic mandibular angle, and achieved good results. The history of mandibular angle reduction plastic surgery in China has been 10 years, and it has achieved great achievements and good results. However, the achievements were limited to academic exchanges and did not have a great impact on the society, so they appeared unknown. Domestic plastic surgery experts actively promote the pioneering achievements in the field of mandibular angle plastic surgery to the society, turn academic achievements into achievements, and serve the majority of beauty lovers.