1. Incision: make an incision on the palatal mucosa at a distance of 1 ~ 2 mm from the gingival sulcus, and cut back from the lateral incisors, so that the maxillary tubercle bends outward and backward, reaching the lateral side of the lingual palatal arch, not exceeding the lateral side of the pterygomandibular ligament, and avoiding exposing the buccal fat pad. The hard palate incision should be deep to the palatal bone surface, and care should be taken not to damage the descending palatal vascular nerve bundle.

2. Stripping the mucoperiosteal flap: Lift the hard palate mucoperiosteal flap from the bone surface quickly and accurately with a stripper to reach the fracture edge. When stripping, blood should be drawn in time to make the surgical field clear, and normal saline gauze should be pressed at any time to stop bleeding, so as to reduce the amount of bleeding during operation.

3. Cut the edge of the crack: use a sharp blade. 1 1 Carefully cut the edge tissue of the cleft groove from the front end to the end of the uvula, because the edge of the soft palate, especially some tissues of the uvula, is very fragile and easy to tear, so be careful when cutting.

4. Breaking the pterygoid hook: at the back end of the lateral incision, above the maxillary tubercle and touching the pterygoid hook, use a stripper to break the pterygoid hook or use a bone chisel to make the tensor veli palatini lose its original tension, and the palatal flap tissues on both sides can be relaxed.

5. Stripping off the vascular nerve bundle: lift the mucoperiosteal flap to expose the holes on both sides of the palate, cut the periosteum along the direction of the vascular nerve bundle, and carefully free the vascular nerve bundle 1 ~ 2 cm to eliminate its restraint on the soft palate.

6. Separation of nasal mucosa: Insert the arc stripper along the nasal side of the hard palate to widely separate the nasal mucosa on both sides, so as to relax it for central suture.

7. Cutting off the palatine aponeurosis: Pull the mucoperiosteal flap to the lateral posterior side to expose the palatine aponeurosis at the junction of soft and hard palates, and then cut off the palatine aponeurosis along the posterior edge of the palatine bone. Then decide whether to cut off the nasal mucosa according to the size and relaxation of the crack. This will give the soft palate and nasal mucosa full freedom.

8. Suture and wound treatment: suture the mucoperiosteal flaps on both sides of the palate and the midline soft palate. When suturing, the nasal mucosa is sutured from front to back, then the soft palate muscle layer is sutured from the uvula forward, and finally the oral mucosa is sutured. After suture, iodoform gauze strips were inserted into the relaxed incisions on both sides to prevent postoperative bleeding, protect the wound surface, reduce tissue tension and promote wound healing. Be careful not to over-stuff, so as not to cause the wound edge of loose incision to evert. But the wing hook should be wrapped tightly to prevent the loose incision from everting. However, the wing hook should be tightly wrapped to prevent the pterygoid process from shifting or bleeding from the wound.