China’s blood donation law stipulates that healthy citizens should not donate blood for shorter than 6 months, and a person can donate blood once in about 6 months, because when donating blood, the general volume of blood donated is between 300-400ml, the body will lose some blood cells, including red blood cells, white blood cells, platelets, and also some plasma, which has water, albumin, globulin, various clotting factors, and various electrolytes These include water, albumin, globulin, various clotting factors, and various electrolytes. Generally, the recovery time for water, white blood cells, electrolytes and platelets is relatively fast, and they can be restored to their pre-donation levels in about one month. However, the recovery time for red blood cells is the slowest, often taking 3-4 months to return to pre-donation levels. In order to ensure the quality of blood and the health of our citizens, China stipulates that blood can only be donated once in about 6 months.