An enema is a treatment method that involves injecting an irrigation fluid through a catheter to the anus and inserting it into the colon through the rectum to achieve aeration and defecation. Enema can stimulate intestinal peristalsis, soften and remove feces, dilute intestinal toxins and reduce absorption. The main method of enema is to prepare the items used for enema, explain the necessity and significance of enema to the patient, get the patient’s understanding and support, ask him to urinate after the position, the patient usually take the left side lying position. Then hang the enema tube on the rack with the liquid level 40-60cm from the anus, lubricate the anal tube and vent, then clamp the steel tube, and after lightly rubbing the anal sphincter, insert the anal tube into the rectum. Then loosen the clamp, make the solution drip slowly, and then clamp the anal tube closed after the liquid drips gradually, then wrap the anal tube with toilet paper and pull out the anal tube. Ask the patient to lie down and keep it for 5-10 minutes before defecating. After the operation, you need to clean up the materials, arrange the patient’s clothes and keep records.