There is generally no need to do colonoscopy before anal fistula surgery. Enteroscopy is mainly used for some intestinal diseases, such as intestinal infections or intestinal tumors, and only some simple auxiliary inspection items are needed before anal fistula surgery, such as blood routine, coagulation routine, electrocardiogram, perianal MRI, rectal cavity ultrasound, etc., and it is often not necessary to do enteroscopy. However, there are a few anal fistula patients who also want to check for the presence of intestinal lesions, can take enteroscopy, including ordinary enteroscopy and painless enteroscopy. Before anal fistula surgery must actively cooperate with the doctor to take the relevant examination, after the operation, pay attention to regular incision drug change, if there is a serious infection phenomenon, should promptly consult the doctor to avoid delaying the aggravation of the condition.