The indications for fecal transplantation are severe constipation, irritable bowel syndrome, ulcerative colitis, Crohn’s disease, and autism. Fecal transplantation mainly extracts normal flora from the stool of healthy people and transplants them into the intestines of patients to enhance the survival of beneficial bacteria in the intestine and improve intestinal immunity, which can achieve a curative effect. In some people, constipation is not related to organic diseases, and constipation can occur repeatedly. Patients with severe and repeated constipation can be treated with fecal bacteria transplantation. The onset of irritable bowel syndrome is related to a variety of factors, and a number of people have an imbalance of intestinal flora, and fecal transplantation for irritable bowel syndrome patients has a good improvement effect. Ulcerative colitis, which is caused by the presence of ulcerative surfaces in the colonic mucosa, is associated with an imbalance in intestinal flora and can also be improved with fecal transplantation. Crohn’s disease, which has an unknown cause and is difficult to treat, can also be effectively improved by fecal transplantation. Many children suffer from autism, which can be improved with fecal transplantation and can also be used to treat autism in children.