Patients with brain tumors need to go to ICU for monitoring and treatment after craniotomy in most cases. ICU, also known as intensive care unit, is a department responsible for monitoring and resuscitation of critically ill patients, and there are ventilators, cardiac monitors, and various deep vein central venous pressure monitoring equipment in ICU. After cranio-cerebral surgery, the patient’s anesthesia time is long, and the patient may not fully recover from autonomic respiration, so he or she needs to go to the intensive care unit, or ICU, to wear a ventilator for assisted breathing treatment. In addition, if the cranial surgery involves important deep parts, the patient’s circulation and blood pressure are not yet too stable, and abnormalities may occur after the operation, so it is also necessary to go to the ICU for monitoring and treatment, and if necessary, it is necessary to carry out treatment measures to maintain the stability of blood pressure, respiration and other vital signs, and generally need to stay in the ICU for about a day. If the patient’s condition is stable, the anesthesia is awakened and the tracheal tube is removed on the second day after surgery, he can be transferred from the ICU to the general ward for the next step of treatment.