Perianal magnetic resonance can check the pathological changes of local organic lesions or inflammatory adhesive tissues in the perianal area, and is mainly used as the main means to check perianal tumors and anal fistulas. Perianal tumor patients do perianal magnetic resonance examination, can determine the size of the tumor, tumor boundaries, texture of the specific location, but also can determine the relationship between the tumor and adjacent organs, clear whether there is a lymph node enlargement. Through magnetic resonance examination, patients with anal fistula can clarify the direction of the fistula and the location of the internal opening, which facilitates the design of the surgery and the query of the loopholes in the surgery, and can clean up the hidden internal opening. In conclusion, perianal magnetic resonance examination has a relatively important role in the diagnosis and treatment of perianal diseases, especially for pre-surgical evaluation and design of surgical program. If you have any symptoms of physical discomfort, you should go to the hospital in time, consult the doctor’s guidance and follow the doctor’s advice.