The scalp tissue is interrupted continuously and partially incomplete, which belongs to scalp defect. Scalp defect can be caused by congenital or congenital diseases, such as meningocele; It may also be caused by acquired scalp injury. The most common is scalp trauma. Small scalp defects can be treated by direct scalp suture. The big one needs to dive a few centimeters below the aponeurosis of the cap before suture. Generally, defects larger than 6 cm are difficult to suture directly by this method, so it is necessary to increase auxiliary incision to reduce tension suture. Other suture methods: 1 circular and rhombus adopt S-shaped incision, extend the incision in the opposite direction along the axis of the wound, separate the lower layers of the cap aponeurosis on both sides of the wound, and then slide the flap back and forth to suture the wound into two layers. Triangular scalp defect adopts three-arm incision, and arc incision is made along three corners of the wound in different directions, and the length depends on the size of the defect. Completely separate the subcutaneous layer of the incision, rotate the sliding flap and suture the wound in two layers. 3. Repair the common posterior temporal parietal flap or posterior temporal occipital flap with transfer flap to repair the anterior parietal wound; The axial flap of occipital artery moved forward to repair the temporoparietal wound; Retrograde temporal parioccipital flap for repairing parioccipital wound. 4 scalp skin grafting 5 scalp bag expansion method. Tension-reducing suture