 There are many limitations in the current treatments of Inflammatory bowel disease IBD. Now the investigators realized that the intestinal microecological is closely associated with the development of IBD. So the standardized fecal microbiota transplantation is considered to be simple but effective emerging therapies for the treatment of IBD. In this project the investigators intend to carry out a single-center, randomized, single-blind clinical intervention study. The investigators will recruit 40 patients with IBD 20 cases of Ulcerative Colitis and 20 cases of Crohns disease in China. The patients will be randomly divided into 2 groups, one group will be given treatment of standardized fecal microbiota transplantation, the other will be simply treated with mesalazine, followed up for at least 1 year. The investigators propose to determine the efficiency, durability and safety of Standardized Fecal Microbiota Transplantation for IBD treatment. 