Examination: Palpation, probe examination, injection of dye, hydrogen peroxide irrigation. Interventional methods include low incision and high latex tube drainage or hydrogen peroxide irrigation. The hydrogen peroxide irrigation method is suitable for all kinds of fistulas, especially high and complex ones. Method: Place 3 to 4 dry cotton balls above the dentate line inside the rectum under the horn-shaped anoscope to prevent hydrogen peroxide from entering the rectal cavity and burning the intestinal mucosa. Attach a fine plastic tube to a syringe filled with hydrogen peroxide and insert it into the external opening of the anal fistula. Moderately press the external opening with gauze, and slowly inject the hydrogen peroxide into the duct. Under the anoscope, white foam can be seen flowing out from the internal opening. Treatment: A minority of perianal abscesses can be dissipated with antibiotics, hot water sitz baths, and local physiotherapy, but most require surgical treatment. Our hospital's Department of Anorectal Diseases is a clinical specialty department that integrates treatment and prevention, with several anorectal experts. We have introduced the American PPH treatment device and the American ZZ-ⅡD type anorectal comprehensive treatment instrument. The chief physician adopts strict sterile operation throughout the surgery and a reasonable anesthesia method to ensure painlessness during the operation.