1. Postoperative hemorrhage is life-threatening, requiring a second operation if necessary; 2. Local or systemic infection; 3. Organ failure(include DIC); 4. Water and electrolyte balance disorders; 5. Induces deterioration of existing or underlying diseases; 6. Postoperative intestinal adhesions, adhesive intestinal obstruction, abdominal abscess, pelvic abscess, etc. 7. Postoperative portal phlebitis, liver abscess.