The impact of the chin on the face is quite prominent. In physiognomy, the chin is commonly known as the earth’s pavilion and should be full and powerful. The chin can show a person’s willpower and perseverance. We will often find that some girls have a pair of big eyes, pretty nose, fair face, but look a little awkward, why? At this time may be the chin is too short, affecting the harmony of the five features. How to determine the small chin deformity? A short chin, also known as chin, is medically known as a small chin deformity. From an aesthetic point of view, the harmony of the relationship between nose, lips and chin is one of the most important signs of beauty. A normal or upturned chin is not only regarded as a sign of beauty, but also symbolizes intelligence and charm, otherwise it is regarded as a character trait of stupidity and weakness. If the chin is underdeveloped, it will give the face a “bird face” shape, which will naturally make people feel awkward. Doctors in plastic surgery for patients before the cosmetic surgery, is this way to determine whether there is a small chin deformity: first of all, with the three stops and five eyes aesthetic method of craniofacial division into the upper, middle and lower three stops, if the lower stops are shorter, that is, a small chin. In addition, it is necessary to use Ricketts aesthetic plane method to analyze, in the lateral facial position, if the nose point, lip point and chin point (chin point) is normal, the three should be in a straight line. If the chin point is behind the line, the chin is small. The distance between the chin point and the straight line (Ricketts’ aesthetic plane) of a small chin, which is the distance the chin is to be lengthened, is the mathematical basis for chin augmentation. Small chin deformity plastic surgery methods? 1, Prosthesis implantation (Figure 1, 2, 3): According to the preoperative aesthetic side measurements, the shape and thickness of the prosthesis are determined, and the finished chin prosthesis is modified according to the customer’s personalized characteristics to make a practical prosthesis. Surgery is performed using a 2cm long minimally invasive incision inside the mouth, then the sculpted practical prosthesis is implanted under the periosteum and fixed with sutures, the sutures are removed in 7-10 days, and no traces of surgery can be seen externally after recovery. A larger feeling of chin is usually found after the surgery because the local swelling has not subsided completely and the blood clots around the periphery of the prosthesis have not been absorbed completely. Usually after three months, a forward, vivid and attractive chin is really formed. 2.Chinoplasty (Figure 4): for heavier small chin (small chin deformity). Chinoplasty is a horizontal osteotomy forward of the chin. The incision for this cosmetic surgery is usually made in the mouth in order to minimize facial scarring. The amputated chin bone is moved forward and downward according to aesthetic criteria and patient’s request, and then fixed with a miniature titanium plate with excellent histocompatibility, so that after three months of recovery, the amputated bone grows back together completely, thus achieving a permanent cosmetic effect.