According to the different types of surgical wounds, the order of dressing change also varies, take cleaning the wound as an example, the basic steps are as follows: 1, first of all, prepare gauze, vital iodine cotton balls, dressings, etc., use both hands to remove the patient’s outer layer of dressings, and use tweezers or pliers to remove the patient’s inner layer of dressings. 2, observe the color of the wound as well as whether there is any subcutaneous accumulation of fluids, pain, and other discomforts, make sure that there is no abnormality, and then disinfect twice in sequence with the vital iodine cotton balls along the middle of the wound to the Disinfect both sides in turn twice.3. After the wound is dry with vital iodine, cover it with sterile gauze and dressing. For contaminated wounds, the steps of dressing change are as follows: First, prepare the cotton balls of vital iodine, cotton balls of hydrogen peroxide, cotton balls of saline, sterile gauze and dressing, etc. Second, put on the gloves and take off the gloves. Secondly, remove the outer layer of the patient’s dressing after wearing gloves, and remove the inner layer of the patient’s wound dressing with forceps or pliers. For contaminated wounds, first give vital iodine cotton balls to disinfect twice, then give hydrogen peroxide cotton balls to disinfect twice, and finally saline cotton balls to clean up the secretion of the wound. If there is granulation tissue edema on the wound, local saline wet compresses can be given to cover the sterile gauze and dressing.