The correct name for plasma is hydroxyethyl starch 40 sodium chloride injection. After intravenous drip injection, this drug stays in the blood for a longer period of time, increases plasma osmolality, increases tissue fluid return, increases blood volume, thins the blood, depolymerizes cells that have aggregated, reduces systemic blood viscosity, and improves microcirculation. Side effects such as infusion reaction, urticaria or itching may occur after titration. Hydroxyethyl starch 40 sodium chloride injection is used as a blood volume supplement. It can maintain the effect of blood colloid osmotic pressure and is used in the treatment of blood loss, trauma, burns or toxic shock. The dosage of this product should not be too large at one time to avoid spontaneous bleeding, and the large amount of input can cause increased potassium excretion, which requires appropriate potassium supplementation. People with bleeding tendency and heart failure need to be used with caution, athletes should be used with caution. If patients need to use hydroxyethyl starch 40 sodium chloride injection, please under the guidance of a doctor to use reasonable medication.