Perianal abscess surgery does not all form anal fistula, whether perianal abscess develops into anal fistula, need to be combined with the type of perianal abscess, surgery, some will not develop into anal fistula, some will, as follows: 1, will not develop into anal fistula: perform perianal abscess one-time radical surgery patients, if the location of the inner mouth has been explored clearly in the operation, and the inner mouth together with the incision, in general, will not develop into anal fistula after surgery If the location of the internal orifice is clearly identified during surgery and the internal orifice is incised, postoperative fistula will not develop. The majority of patients with perianal abscesses that undergo simple incision and drainage do not develop into anal fistulas. 2, will develop into anal fistulas: most patients with perianal abscesses that undergo simple incision and drainage form anal fistulas that require secondary surgery to cure. At present, most of the perianal abscesses in the clinic take a one-time radical surgery to avoid the development of anal fistula after surgery requires secondary surgery.