How long it takes for fluid to be absorbed after surgery is objectively analyzed based on the amount of fluid and the size of the patient’s surgical wound. First, if the patient is a superficial mass removal and other smaller surgery. The surgical wound is smaller, and the fluid accumulation after surgery is also smaller, usually 5-7 days trauma area fluid can be completely absorbed. Second, if the patient undergoes radical surgery for malignant tumors, such as gastric malignant tumors, liver malignant tumors and so on. The surgical wound is often larger, and the postoperative effusion ooze is also larger. If there is no obvious postoperative leakage, the effusion can be absorbed in about two weeks after surgery. If the patient develops lymphatic fistula, biliary fistula, intestinal fistula and other symptoms after surgery, the fluid will take about three weeks to be completely absorbed.