Anal dilatation can use finger dilatation method or instrumental dilatation method. 1. Finger expansion method: the doctor uses the finger on the patient’s anus to expand the anal treatment, after full communication with the patient, the operator asked the patient to knee-chest position, the fingers of both hands in the adequate lubrication, the first hand of the first hand index finger anus to the front and back to the left and right expansion of the anus, adapt to the inclusion of the other hand’s index finger to the front and back to the right and left to the expansion of the anus, the gradual expansion of the anus to the four-finger anus to the front and back to the left and right to the expansion of the anus, generally lasts for five minutes or so. 2. Instruments to expand the anus method: you can use a special anal expansion metal rod or electric massage rod to expand the anus, after sufficient lubrication in accordance with the diameter of small to large order gradually expand the anus. Patients in the anal expansion period to eat a light diet, food to soft-based, to avoid constipation, before anal expansion to drain clean stools, but also pay attention to the hygiene and cleanliness of the perianal area, the daily use of 1:5000 potassium permanganate solution sitz bath. The expansion of the anus should be carried out under the guidance of a professional doctor, patients should not expand the anus on their own, in order to prevent improper operation, roughness and so on, leading to anal sphincter tear and other adverse consequences.