Injecting a small amount of air into the body will not have much effect on the human body. A small amount of air entering the body will be dissolved by the blood in the blood and will not produce adverse reactions. However, if a large amount of air enters, it can cause capillary air embolism, leading to pulmonary embolism, thus seriously endangering the patient’s life. However, this situation rarely occurs in the general infusion process, because a large amount of air will not enter during the infusion, so there is no need to worry too much. When performing intravenous infusion, if the operation is not carried out in strict accordance with the specifications and the air in the infusion line is not completely evacuated, this condition may enter some air bubbles during the infusion process. Still need to strictly follow the operation specification to try to avoid the air into the body.