Ulcerative colitis (UC) is a chronic recurrent disease of unknown etiology associated with infectious, immune, genetic and psychological factors. The lesions are mainly confined to the colonic mucosa, with ulcerative erosions, mostly involving the distal colon, but can spread to the proximal colon and throughout the colon. The main symptoms are diarrhea, pus and blood stools, abdominal pain and shortness of breath, and the symptoms are recurrent and difficult to be cured. It can be divided into acute and chronic phases. Complications include toxic megacolon, intestinal perforation, massive blood in the stool, and pseudopolyp formation. The disease is even related to the development of colon cancer, so it is classified as one of the difficult-to-treat diseases by the World Health Organization. Western medicine mostly uses drugs such as salazosulfapyridine, adrenal glucocorticoids and immunosuppressive drugs for treatment, but the efficacy is not yet satisfactory and there are more side effects, so it is especially important and necessary to find new treatment methods. The use of colonic irrigation dialysis machine with herbal preserved enema is a new method for the treatment of ulcerative colitis in recent years. The colonic infusion dialysis machine removes harmful substances such as persistent stool and enterogenic endotoxins accumulated on the intestinal wall through whole colon cleansing, and establishes a clean and effective intracolonic environment, which is conducive to the repair of the colonic mucosa. Then use the strong adsorption function of the colonic mucosa to carry out symptomatic drug treatment through the colon, so that the drug acts directly on the lesion, so that the drug reaches the disease directly, avoiding the drawback of oral medication being the farthest from the wide intestine, and the drug is not easy to reach. The main manifestations of active ulcerative colitis are pus and blood stools, abdominal pain, and shortness of breath, which are dominated by the real evil, so we use Chinese medicine colonic enema to clear heat, dry dampness and cool blood. One is because the Chinese medicine itself has the effect of clearing heat and detoxifying, invigorating blood circulation, removing decay and creating muscle, which can make the symptoms improve rapidly and repair the damaged mucosa; second is that the colonic irrigation machine administration increases the depth of drug delivery and the range of drug contact with the intestine, which can make the drug reach the lesion directly and reach a higher drug concentration locally, and form a protective film in the intestine to promote the disappearance of edema, inflammation and ulcers; third is that by colon cleansing before the enema It can effectively cleanse the intestinal tract and help remove harmful microorganisms and toxic substances that damage the mucosa on the intestinal cavity and intestinal mucosa, so that the drugs can be more easily absorbed by the body and work locally to produce better therapeutic effects.