The jaw angle is too wide, causing a loss of smoothness in the female facial contour, so many candidates seek jaw angle surgery to improve the shape of the lower face. However, various inappropriate jaw angle osteotomies (or resections) have caused many patients to lose their natural jaw angle while narrowing their lower face, resulting in double angle deformities, unnatural contours, and jaw angle depressions after surgery. While the enlarged jaw angle certainly affects the aesthetic appearance, the absence and deformity of the jaw angle is not only unattractive but also loses its normal physiological function. In addition, some candidates have a wider lower face, but it is not the cause of the jaw angle, so blind removal is prone to bring adverse consequences. The angle of the jaw is a part of the jaw bone and has its own unique physiological function. At the same time, the well-defined bony apex of the jaw angle supports the soft tissue to form the jaw angle marker point on the body surface, forming a natural and smooth lateral line. In general, the aesthetically pleasing mandibular angle apex is marked on the body surface at 2 to 3 cm below the earlobe, therefore, seeking a mandibular angioplasty that preserves the complete morphology and physiological function of the mandibular angle can make the candidate beautiful while effectively preventing postoperative angular deformity. In recent years, I have learned from the experience of surgery, based on the facial shape of the mandibular angle hypertrophy candidates, preoperative mandibular angle body surface marker points, predicted postoperative mandibular angle body surface marker points, combined with three-dimensional CT, to determine the extent of the mandibular angle and mandibular bone outer plate need to be removed and retained, retain the mandibular angle apex and natural form, postoperative mandibular angle apex in the body surface has a clear line and support. To achieve a natural and beautiful lower face curve after surgery. The jaw angle is an important anatomical structure of the jaw and face and has an important physiological function, it is not optional or the smaller the better. Even in a normal population with a very aesthetically pleasing face, 3D CT shows that most people have a pronounced jaw angle pattern, a thick bulging bite, and a moderately flared jaw angle. Therefore, the goal of jaw angioplasty is to trim an enlarged, unattractive jaw angle shape into a harmonious, aesthetically pleasing, natural-looking jaw angle rather than simply removing it. The patient who seeks jaw angle surgery for an enlarged jaw angle wants a smooth and beautiful lower facial contour. There are individual differences in the concept of beauty, some people like a beautiful and natural contour, while others prefer an exaggerated shape such as a “cone face”. The aesthetics of people have also changed with social trends, and many people who have had excessive jaw angle removal and exaggerated face shapes in the past are now seeking repair. As a plastic and cosmetic surgeon, you can adjust the surgical plan within the appropriate aesthetic range, but excessive excision that hurts the physiological function simply to meet the requirements of the candidate is undesirable. Many Asians have a wide flat cranial shape with a wide forehead, temporal bulge, and a wide upper and lower face, and simple jaw angle surgery is not effective. In addition, concave facial shape, too short facial length, and anticuspid candidates are not suitable for jaw angle surgery although the lower part of the face is wider. There is no fixed angle of jaw angle for everyone, and simply removing the jaw angle at a fixed angle will definitely cause unattractive results for some candidates. Improper excessive removal of the jaw angle not only does not result in a beautiful facial contour, but also causes many people to lose their normal jaw angle and brings about many problems: double angle deformity, unnatural facial contour, sunken jaw angle, etc. In normal people, a strong bite muscle is attached to the jaw angle. Once too much of it is removed, the attachment point of the bite muscle moves upward, making surgical repair and reconstruction of the jaw angle more difficult. In many cases, the CT film shows a rounded jaw angle in the jaw angle area, but the jaw angle profile cannot be found on the lateral side of the patient. The reason is that too much bone has been removed from the jaw angle area, resulting in the projection of the apex of the jaw angle on the body surface higher than the earlobe, or too depressed to form the jaw angle appearance on the body surface. A clear understanding of the postoperative jaw angle shape should be obtained when determining the surgical plan before surgery. In mandibular osteotomy, the body surface mark of the mandibular angle is used as the measurement point for surgical design, and the extent of resection and bone volume are determined before surgery based on the mark point of the bony apex of the mandibular angle on the body surface, combined with 3D CT, which preserves the natural shape and physiological structure of the mandibular angle after surgery to ensure the formation of a normal mandibular angle after surgery and maintain the original physiological function. At the same time, a soft and natural appearance of the jaw angle is formed in the lower part. The key points are summarized as follows: 1. Strict selection of indications 2. Pre-operative determination of the post-operative mandibular angle apex position according to the mandibular angle appearance and mandibular angle apex position 3. Determination of the debridement range and debridement volume of the mandibular angle according to the post-operative mandibular angle apex position.