The process of dressing change operation mainly includes several steps such as preparation before dressing change, removal of dressing, disinfection and wound treatment, bandaging and fixation. The purpose is to observe and understand whether the wound is infected and healing growth, and at the same time to keep the wound clean and promote healing. 1. Preparation for dressing change: the doctor should fully understand the condition of the wound and take necessary protective measures; prepare the necessary supplies for dressing change; introduce the situation to the patient to obtain cooperation, adopt the position that is comfortable for the patient and with the best wound exposure, and pay attention to the protection of privacy. 2. Remove the dressing: the outer layer of adhesive tape is removed, pay attention to the protection of the skin; the inner layer of the dressing is removed with sterile tweezers; if the dressing is adherent to the wound, it can be wetted with sterile saline and then slowly removed; if the dressing is dry and crusted, it can be cut off and only part of the crust is left to fall off automatically when healing occurs. 3. Disinfection and wound treatment: The skin around the wound should be disinfected from the inside out with iodine or 75% alcohol cotton balls, and the disinfectant should not flow back to the inside of the wound. Wounds need to be dealt with according to different situations, generally with semi-dry wet saline or disinfectant cotton balls from the inside out to gently wipe to remove secretions, wipe the cotton ball no longer touch back. 4. bandage fixation: after treatment with sterile dry gauze generally cover more than 8 layers (a piece of gauze for 4 layers), adhesive tape adhesive fixation; trauma large, oozing more can be added with cotton pads, adhesive tape is not easy to fix the bandage bandage. The operation needs to pay attention to the aseptic requirements, the action should be gentle, to avoid injury.