The operation steps and precautions for wound dressing change are as follows: 1. Before changing the dressing, remove the original dressing and clean the patient’s wound. For the inner layer of the dressing adhering to the wound, it should not be forcibly torn off, and needs to be soaked and wetted with salt water and then removed. 2. Disinfect the wound twice with a disinfectant solution such as iodophor solution. For drainage strips, they should be replaced if there is a lot of drainage fluid; if there is little or no drainage fluid, they need to be removed. Then cover the wound with iodophor gauze and wrap it with gauze, bandages, etc. For smaller wounds, Band-Aids or dressing patches can be applied directly after sterilization. 3. When changing the dressing, pay attention to observe the aseptic operation to prevent wound infection. 4. After dressing change and fixation, if the affected limb needs to be suspended, it can be suspended with a bandage. 5. Pay attention to advise the patient to do regular wound dressing change treatment.