Enema is a common clinical treatment for patients with chronic constipation, general enema is recommended that the patient take the lateral position, through the anus lubrication paraffin oil, the catheter of the enema slowly into the anus, do not be too rough, so as not to cause damage to the mucous membrane of the anal canal, resulting in localized bleeding and pain symptoms. After the catheter is inserted into the lower part of the rectum, the enema solution slowly enters the patient’s colon through the effect of gravity or extrusion. When the enema liquid enters the colon, it is recommended that the patient continuously hold it for 3-5 minutes, so that the drug can be fully combined with the intestinal contents, and the excretion of intestinal contents can be effectively induced. If the patient holds the enema for a shorter period of time, it is not possible to fully combine the intestinal contents with the drug, which will cause the patient’s stool to be unable to be discharged, resulting in the failure of the enema.