Dilute autologous blood transfusion is one of the three main technical methods of autologous blood transfusion, in which a certain amount of blood is drawn before the preoperative transfusion and saved, and then a certain amount of colloidal fluid or isotonic saline is transfused in to replenish the blood volume. After the blood dilution if heavy bleeding during surgery, dilute the blood bleeding than dilute before bleeding tangible component loss will lead to a reduction, after the transfusion can use their own blood back into the transfusion, both safe and effective. With this method there are certain conditions, not everyone can dilute autologous blood transfusion, with the patient’s own physical quality, physical condition, the indications conditions are hemoglobin > 110g/L, red blood cell pressure product > 0.30 patients, intraoperative to closely observe, do not due to blood dilution blood volume decline, oxygen-carrying capacity decline in symptoms. If the patient has adverse reactions after the blood is drawn, the treatment must also be corrected in time. Therefore, diluted autologous blood transfusion is a very good technique for autologous blood transfusion, but it also depends on the condition of each patient, and it is usually suitable for patients who are relatively healthy, and it is not recommended for pregnant women who are not salvage type or have poor health themselves.