Blood preparation before surgery is an important preparation before surgery. As a surgeon, you must take into account all the contingencies as much as possible before surgery, and make preparations to improve the corresponding preventive measures and remedial measures after the accident. Blood preparation is one of the important measures. It is not necessary to use blood, but now the state regulates the management of blood collection and use. If the blood is not used, the deposit can be returned to the blood management office after discharge. If the blood is used during hospitalization, the blood donor card can also be refunded after the family donates blood.