After hemorrhoid surgery, you can keep the wound clean and dry by changing the medicine on time, fumigation sitz bath and so on. 1. Change the medicine on time: it takes a long time to change the medicine for the postoperative wound, usually 1~2 times a day in the early stage, and 1~2 days in the later stage, and it may take about half a month to one month for the medicine to be changed until the wound heals. This is because the rectal canal is susceptible to contamination by urine, feces, etc. After surgery, because of the wound, it is easy to incision infection, so be sure to change the medicine regularly to keep the wound clean and dry. 2. Fumigation sitz bath: patients can use 1:5000 potassium permanganate solution warm water sitz bath after bowel movement and in the morning and evening every day, or under the guidance of the doctor to use traditional Chinese medicine sitz bath, which can keep the wound clean, and is conducive to the absorption and dissipation of inflammation. At the same time, the patient’s diet needs to eat more vegetables, fruits, regular diet, to prevent constipation, because high-fiber diet can form loose stools, reduce the stimulation of the surgical wound. After being discharged from the hospital, patients need to follow the doctor’s instructions for regular follow-up to check the wound healing. If there is redness, swelling, heat or pain in the wound, they should go to the hospital promptly.