The intestinal microbiota plays a pivotal role in the maintenance of intestinal homeostasis and protecting the gut against pathogens by competing for nutrients, creating the intestinal biological barrier and modulating the host immune system.After the onset of acute pancreatitis,the intestinal hypoperfusion and the release of inflammatory mediators result in intestinal barrier dysfunction and intestinal bacteria dysbiosis.This leads to Bacterial and endotoxin translocation, which may cause infectious complications which are major causes of death in SAP patients.Recently,FMT was shown its efficacy in the treatment of gastrointestinal(GI) diseases and non-GI disorders associated with Intestinal flora disturbance by re-establishing the damaged Intestinal Bacteria homeostasis.However,the mechanism by which FMT results in cure of diseases has been poorly understood.This study aims to investigate the therapeutic potential of FMT for SAP patients with intestinal barrier dysfunction.