Comparison of jaw operation methods: one is the traditional bone grinding osteotomy, while our department adopts the original point-to-line precise arc lengthening osteotomy, which not only changes the width and thickness of mandible, but also achieves the perfection of arc. In this operation, director Wu Yi applied for a national patent mandibular measuring instrument to correct and avoid the asymmetry of bilateral mandibles. Traditional surgical osteotomy will inevitably lead to bilateral asymmetry, and traditional linear osteotomy will inevitably form the second mandible and square chin. The bone was cut off, but it was not beautiful. If the hospital is concerned with how to cut the mandible, we are concerned with the perfect curve effect after cutting. Compared with the time to complete the operation, the traditional operation takes 3 to 4 hours, while Director Wu Yi only needs 40 minutes, which depends on Director Wu Yi's accurate mastery of the operation. From 1999, the first operation of changing square face into oval face in southwest China was completed. The number of operations completed by our department ranks among the top in China, and there was no medical accident. This depends not only on the skills of doctors, but also on the strength of general hospitals and the safety guarantee of complete medical equipment.