Enema is the technique of using a catheter to instill saline, drugs or related solutions into the rectum or colon through the anus to achieve the effect of defecation, exhaustion or treatment of diseases, and is a common clinical treatment method. 1. It can soften and remove feces, expel gas in the intestine, relieve the discomfort of constipation, dilute and remove harmful substances in the intestine, reduce the effect of poisoning and cool down patients with high fever; 3, retention enema: infusion of medicinal solution, retained in the rectum or colon, absorbed through the intestinal mucosa to achieve the purpose of treatment, commonly used clinically for sedation, hypnosis, treatment of intestinal diseases, etc. Enema is a professional, invasive operation, patients with severe constipation, do not private enemas to avoid perianal breakage and bleeding, irritation of the intestine, infection and other adverse events, it is recommended that patients who need enemas, go to the local regular hospital, consult the doctor whether there is a need for enemas, apply the appropriate method to solve the problem.