The patients assigned to the restrictive group will receive transfusion once the hemoglobin concentration falls below 6.0 g per deciliter, with a target hemoglobin range of 7.5 to 8.0 g per deciliter. Patients assigned to the liberal group will receive transfusion once the hemoglobin concentration falls below 8.0 g per deciliter, with a target hemoglobin range of 9.0 to 10.0 g per deciliter.

The primary outcome: Survival rate in six months after randomization.

Secondary outcomes: Incidence of perioperative complications, including sepsis , pulmonary complications, portal vein thrombosis, hepatic artery thrombosis and transfusion-related adverse events. Intraoperative blood loss, intraoperative blood transfusion amount, postoperative blood transfusion amount in 7 days after surgery, postoperative inflammatory reaction, mechanical ventilation time in the intensive care unit, lengths of stay in the intensive care unit and the hospital，and hospitalization expenses.

Inclusion Criteria:

• The investigators study included pediatric patients (the moon's age <36 months) who will receive standard living-donor liver transplantation (LDLT) in Renji Hospital.

Exclusion Criteria:

• The exclusion criteria of the study were a congenital sufferer from heart, lung, kidney, nervous system or blood disease,active Lung infection, a history of liver transplantation, Multivisceral transplantation, refused to participate the study.