There are several reasons for fever after intracranial aneurysm surgery, which are as follows: 1. Aneurysm rupture leads to subarachnoid hemorrhage, and subarachnoid hemorrhage will have the problem of heat absorption during the absorption process, and the body temperature is often below 38.5℃, and seldom will be more than 38.5℃ or more than 39℃; 2. If the patient’s condition is not too good before the operation, and he even has lung inflammation, and hemorrhage, and then there are vomiting and aspiration, there will be lung infection. If the patient’s condition is not too good before surgery, or even has lung inflammation, or bleeding, or has vomiting or aspiration at that time, there will be lung infection, and persistent fever will also occur. Treatment is mainly based on drug therapy, and at the same time assisted by physical therapy, which can improve the patient’s disease process.