Inclusion Criteria:  ECOG 0-2; The amylase value in the drainage tube of patients receiving pancreaticoduodenectomy or distal pancreatectomy was lower than 5000 IU/L on the first day after surgery; postoperative drainage tube placement; Patients with no obvious contraindication to surgery; Expected postoperative survival ≥3 months;  Exclusion Criteria:  Pancreaticoduodenectomy and pancreaticogastric anastomosis were performed; Suspicion or abdominal bleeding within 5 days after surgery; suspected biliary and intestinal fistula within 5 days after operation; On the fifth day after the operation, abdominal CT reexamination showed local effusion with a depth greater than 3cm.