Jaw angle surgery is commonly known as jaw angle reconstruction, the most common is jaw angle hypertrophy plastic surgery. The jaw angle hypertrophy is due to bone growth in the jaw angle area, or accompanied by varying degrees of hypertrophy of the bite muscle, resulting in a wide face, manifested as a “square face”, can be improved through this surgery. But jaw angle surgery also exists a certain amount of surgical risks, as follows: 1, infection: due to the concept of aseptic operation is not strong, postoperative oral care and application of an adequate amount of antibiotics and caused. Doctors can take immediate drainage, as well as increase the amount of antibiotics treatment; 2, the jaw margin is not flush or the middle of the jaw margin secondary to angular deformity: inadequate exposure of the incision is the operation is difficult to cut neat reason, if serious, feasible second stage surgery to correct; 3, mandibular ascending fracture: due to the mandibular bone cortical thick and hard, if the operation is rough, sometimes may cause serious complications of mandibular ascending fracture; 4, the Hemorrhage: during the operation, the inadvertent operation injures the posterior facial vein or mandibular artery, at which time the surgeon may take emergency filling iodophor gauze compression measures to stop bleeding and other necessary treatments; 5. Swelling: local swelling takes 1-2 weeks to subside, and to reduce swelling, in addition to adequate negative pressure drainage, dexamethasone may be applied for 2-3 days after the operation along with effective antibiotics; 6. Facial nerve injury: mainly in 6. Facial nerve injury: mainly caused by the injury to the surface of the facial nerve branches when removing the occlusal muscle; 7.