The human body’s blood accounts for 7%-8% of body weight under normal circumstances, and the blood volume is about 4200-4800 ml based on the adult weight of 60 kg. When the human body experiences blood loss of about 10%, the body will provide its own inter-tissue fluid to the blood circulation to maintain the blood volume balance and maintain the normal functioning of the body without abnormalities. When the blood loss reaches 10%-20%, the body will experience an accelerated heart rate body, situational hypotension, etc., and requires supplemental fluids to maintain blood circulation. When the body’s water loss reaches 20%-30%, the body should be supplemented with appropriate red blood cells to improve the oxygen-carrying capacity of the blood while carrying out the replenishment of body fluids. When the ischemia of the body reaches or exceeds 30%, whole blood and fluids should be replenished to maintain blood volume. The body’s blood must be maintained in sufficient quantity without lack of useful components and without factors affecting health such as anemia, hypoproteinemia, severe infection and abnormal coagulation.