Inclusion Criteria:  Confirmed IBD patients were collected from the Department of Gastroenterology, The Second Affiliated Hospital of Wenzhou Medical University.According to the consensus of "Diagnosis and treatment of inflammatory bowel disease" formulated by Chinese Society of Gastroenterology, the diagnosis of IBD was established by clinical, laboratory, radiographic, digestive endoscopy and histopathological examination.During the same period, 476 healthy subjects were collected from the physical examination center of our hospital as the normal control group  Exclusion Criteria:  Active infection, malignant tumor, congestive heart failure, demyelination of nervous system, allergy to rat derived protein components, etc All subjects were excluded from infectious diarrhea, ischemic enteropathy, radiation enteritis, gastrointestinal tumor, diabetes, systemic lupus erythematosus, rheumatoid arthritis and autoimmune thyroiditis by clinical examination before inclusion.