Low partial pressure of carbon dioxide refers to the relatively low level of carbon dioxide in the blood, mainly due to excessive carbon dioxide excretion from the body, which is more common in clinical practice as respiratory alkalosis. It should be prevented by covering the mouth and nose with a closed paper sleeve or plastic bag and breathing moderately to increase the concentration of carbon dioxide in the body and raise the partial pressure of carbon dioxide in the blood, thus increasing the partial pressure of carbon dioxide and stabilizing the normal blood gas status to prevent further aggravation of respiratory alkalosis. If necessary, mechanical ventilation can also be chosen to adjust the balance of carbon dioxide and oxygen metabolism. In addition, it is necessary to stabilize the mood, for example, to prevent irritability, not to quarrel, to try to maintain a stable mood, to rest in bed appropriately, to give sedatives such as finasteride and valium if necessary, and to adjust the treatment plan at any time.