Drainage strips need to be placed for surgical dressing changes for a simple low anal fistula. Usually after the low anal fistula surgery, can not immediately suture the open wound surface, need to be placed on the drainage strip, the main purpose is to drain the oozing blood and water out. In addition, there are some inflammatory secretions in the fistula, which also need to be drained out. Placement of drainage strips can also be effective in preventing pseudo-healing of the wound and contamination of the anal opening with feces, intestinal fluids and other contaminants. After the surgery, the short term to disinfect the wound, usually also need to replace the drainage strip, later local secretions can be reduced without the drainage strip, can be applied locally erythromycin ointment, fusidic acid cream and other drugs to promote wound healing. After the low anal fistula surgery, patients need to keep bowel movement, avoid constipation, so as not to lead to wound disintegration or wound infection. If there is any discomfort after the operation, you should follow the doctor’s instructions in a timely manner.