How to replenish blood after surgery needs to be based on the severity and cause of anemia, etc. Different specific ways, such as direct blood transfusion, oral medication, diet, etc., should be adopted to replenish blood. 1. Direct blood transfusion: acute anemia caused by blood loss during surgery, which belongs to hemorrhagic anemia or iron-deficiency anemia. If the amount of blood loss is large, it should be corrected by transfusion of red blood cells immediately during or after surgery. 2. Drugs to replenish blood: if the amount of blood loss during surgery is moderate and within the predicted range, those with moderate anemia can complete the three tests for anemia after surgery, and take iron polysaccharide or other blood replenishing drugs orally. 3. Dietary supplementation of blood: the body can compensate quickly after the operation if the blood loss in the operation is small, or if there is mild anemia before the operation, it can be improved by strengthening the nutritional diet. Dietary supplementation methods include: eating lean meat, pig liver, animal blood and other iron-rich foods and iron-containing vegetables, avoiding tea, coffee and other foods that affect the absorption of iron. Blood replenishment should be carried out under the guidance of a physician, and in case of discomfort, consult a doctor in time to avoid delaying the condition.