Oriental women are beautiful with “oval” shaped face, if the jaw angle is too enlarged, it will form “square” face or “trapezoid” face, which is lack of feminine charm. In Asian race, jaw angle hypertrophy is mainly bone hypertrophy, jaw angle plastic surgery in maxillofacial plastic surgery has become a routine surgery, but there are still many problems and controversies. Now on the jaw angle plastic surgery in five conventional problems, the following answers: 1, the choice of anesthesia in order to strive for aesthetic, jaw angle plastic surgery is now basically used in the implementation of intraoral incision surgery. During the operation, due to the surgical field at the entrance of the airway, there is a danger that foreign objects, secretions and blood may accidentally enter the airway; at the same time, the surgical stripping surface is wide, the osteotomy surface and muscle section are easy to bleed, and the surgical field of vision is small, so it is not easy to stop bleeding. In the early stage, 0.5% lidocaine with appropriate amount of epinephrine is generally used for local infiltration anesthesia of the surgical area, intraoral local nerve block of the inferior alveolar nerve, chin nerve and lingual nerve, percutaneous local infiltration anesthesia of the mandibular subperiosteum is needed for osteotomy and grinding area. Taking local anesthesia in the operation area, during the operation, the candidate can cooperate with the physician, so that the physician can easily observe the candidate’s condition during the operation. However, under local anesthesia, the candidate is conscious and the strong noise of bone grinding can cause fear in the candidate. If the operation time is relatively long, the candidate sometimes can not tolerate the operation, resulting in insufficient bone removal or grinding, which in turn causes bilateral jaw angle asymmetry, unnatural jaw angle curve, and so on. The choice of anesthesia is particularly important in order to ensure the smooth progress of the surgery and the safety during and after the surgery. Considering that the head position of the patient changes and the anesthesiologist’s long-distance operation is often detrimental to airway management, I believe that tracheal intubation general anesthesia is the safest anesthesia method. Transnasal intubation does not affect the surgical operation and is easier to fix than oral intubation. 2, the choice of preoperative examination Before mandibular angioplasty, in addition to routine facial physical examination, CT three-dimensional reconstruction technology has been widely used in clinical practice. Through three-dimensional imaging, the image of every detailed part of the jawbone can be clearly observed, the fixed point is precise, can be observed in multiple directions and angles, and there is no overlapping image, the measurement value is precise, and internal measurement can be done. It is also possible to adjust different windows of CT values to observe soft and bone tissues, and then individualize the surgery for the candidate, design and adopt the best treatment plan, determine the surgical access and open the way, which reduces the risk in mandibuloplasty. Pre-operative measurements and comparisons of bilateral mandibles can be made through cutting techniques and simulated surgery in order to avoid asymmetry in the bilateral mandibular region after surgery and to avoid damage to local blood vessels and nerves. At the same time, I believe that radiographs of the mandible are still indispensable. The curved panoramic X-ray of the mandible can check the degree of hypertrophy and ectropion of the mandibular angle; the lateral cephalometric X-ray can be taken to determine the angle of the mandibular angle as well as the distance between the hypoglossal nerve canal and the mandibular angle; and the bilaterality X-ray of the cephalometric X-ray can be taken to determine the angle of the mandibular angle as well as the distance between the hypoglossal nerve canal, mandibular angle and mandibular rim. This is essential to avoid damage to local blood vessels, nerves and perfect contouring of the jaw angle. 3D printing technology was first applied in the field of mechanical engineering and is now widely used in the medical field, especially in preoperative surgical design and prosthesis fabrication. Through computer simulation and 3D printing of solid models, various preoperative orthognathic osteotomies and bone movement simulations can be carried out, so that the postoperative effect can achieve both aesthetics and functionality, saving the surgery and postoperative recovery time, and the intraoperative operation is more accurate, which significantly reduces the occurrence of postoperative complications.