After craniotomy, three hurdles are not necessarily out of danger, and three hurdles need to be passed after open-road surgery: the first hurdle, bleeding hurdle, refers to the incision or the surgical cavity of the craniotomy is not tight hemostasis, which will easily lead to bleeding in the surgical cavity to form a hematoma, so it is very important to tight hemostasis during the operation, and it is not easy to bleed after 1-2 days after the operation. The second level, cerebral edema level, refers to 3-7 days after craniotomy for the peak of cerebral edema, during this period should actively apply mannitol dehydration to reduce cranial pressure, improve the symptoms of cerebral edema, the third level, infection level, if the operation does not do strict aseptic operation, easy to cause the incision and the cavity of the operation of the infection, and complication of intracranial infections may occur, most often occur in the craniotomy between 1-3 weeks after the period. Therefore, strict aseptic operation is necessary during the operation and postoperative preventive treatment of infection. Even after these three hurdles, the patient may not be able to survive and get out of danger, and the patient may have other complications, such as infection of the cerebrospinal fluid, intracranial infection, changes in intracranial pressure, and hydrocephalus.