 In this projects the investigators aim to re-establish a gut balance of intestinal microecological through Standardized Fecal Microbiota Transplantation for IBD UC and CD. We will establish a standardized isolation, store, and transportion steps of fecal bacteria from donated fresh stool in the laboratory. Then the bacteria will be transplanted to mid-gut by nose-jejunum nutrition tube. Patients in this study will be assigned to receive standardized FMT only once or traditional medicine of mesalazine and would be followed up for at least 1 year. The clinical symptoms, sign, blood tests, abdominal CT, endoscopy and questionnaire will be used to assess the efficiency, durability and safety of Standardized FMT at the start and end of the projects. 