To known the effect of PHGG-rich enteral nutrition to on the infection in liver transplant recipients

Inclusion Criteria:

1. liver transplant recipients
2. age from 18 to 80 years old
3. APACHE II score >12
4. There is an indication for enteral nutrition and it is expected to require oral or tube feeding for more than 7 days
5. there is no intra-abdominal infection or bloodstream infection

Exclusion Criteria:

1. Severe cardiac, kidney and lung dysfunction
2. bowel obstruction, intestinal perforation, intestinal leakage before operation
3. Roux and Y anastomosis during liver transplant