Appendicitis surgical area disinfection site is the right lower abdomen, disinfection three times; sheet laying steps are laying a small sheet, clamping the towel clamp, laying a medium sheet, wearing a surgical gown and gloves, laying a large sheet. Appendicitis surgery is mostly a right lower abdominal incision, with the incision as the center, from inside to outside the stacked tile-like disinfection, the range of the upper to the xiphoid process, the lower to the upper third of the thigh, the left to the anterior axillary line, the right to the posterior axillary line. A total of three times disinfection, each time the range is smaller than the previous one. At present, the general choice of disinfectant is povidone-iodine. When laying a small single should be held in both hands on both sides of the small single quarter, the small single will be laid in the distance from the incision marking line 5cm, the order of the four small single should be the lower side – the opposite side – the upper side – my side, the small single can only be paved from the inside to the outside of the move, can not move to the direction of the incision, and the application of the four scarf pliers to fix the small single. After laying the small sheet, the head side and the foot side should be paved with two pieces of middle sheet, after laying the middle sheet, put on the surgical gown, and lay the big sheet with sterile gloves. The large sheet should align the middle seam with the incision marking line, ensure that the anterior side covers the head frame, and the hanging part of the large sheet is more than 30cm above the operating table. Sterilization and sheet-laying are usually performed after the patient is unconscious from anesthesia, and the principle of asepsis should be followed to avoid the occurrence of infection.