Plasma is one of the most important components of blood, accounting for about 50% of the blood. 80%-90% of the plasma is water, and only about 10% is potassium, sodium, chloride, and various proteins and other organic components. The main role of plasma is used to carry white blood cells for transportation, to maintain the body’s vital activities required for some substances and waste generated in the body and so on. In fact, drawing plasma is the same as drawing blood, because the human hematopoietic system is very strong. Under normal circumstances, a person loses about 400mL of blood, which is basically nothing, and the body will also be replenished in time through blood production. So a moderate amount of plasma donation will not affect the health of the body, and there may also stimulate the hematopoietic function, as long as not too often, there is no harm to people.