Maxillomandibular plastic surgery usually uses some fillers to make the chin (chin) taller or slightly upturned. At present, the commonly used fillers are autogenous bone, cartilage or medical solid silicone rubber. Among them, silicone rubber is convenient in source, easy to form after carving and good in biocompatibility, so it is commonly used. Carved silicone rubber can be implanted according to the shape and retraction degree of the individual chin. Incisions commonly used in submental plastic surgery can be divided into intraoral incision and extraoral incision. Intraoral incision is selected in the gingival sulcus of the lower lip, and there is no surgical trace from the outside, so it is commonly used. The gingival sulcus of the lower lip was cut 1.5-2Cm, and the mandibular periosteum was peeled off to form a pocket, the depth of which was not more than the lower edge of the mandible, and then sterilized filler was implanted and fixed suture was performed, and the whole operation was completed. Attention should be paid to aseptic kneading during operation, the separation cavity should be close to the size of the implant, the two sides should be symmetrical, the hemostasis should be thorough, and the postoperative fixation should be good.