The reasons of limb weakness after brain tumor surgery mainly include surgical damage to the functional area of brain tissue, local edema of brain tissue, cerebral hemorrhage after surgery and so on. 1. Local cerebral edema: due to the local edema after surgical resection of tumor, the symptom of weakness of one side of limb may appear at this time. After the treatment of mannitol to reduce intracranial pressure and ganglioside to nourish the nerves, the muscle power will be restored usually in 1-2 weeks. Drugs need to be used under the guidance of the doctor. 2. Surgical operation damages the functional area: due to the complexity of the situation around the brain tumor, such as the close adhesion between the tumor and the surrounding tissues and organs, the surgical separation of the tumor will more or less produce damage, which in turn will lead to limb weakness. In addition to the above treatments, hyperbaric oxygen and limb function training are often needed, and the patient’s limb muscle power will be restored. 3. Cerebral hemorrhage: cerebral hemorrhage after brain tumor surgery is also very common in clinic, which will also cause one side of limb weakness. In addition to the above treatments, it is also necessary to control the blood pressure, and operate if necessary. If patients feel uncomfortable after brain tumor surgery, it is recommended to go to the hospital for consultation in time, so as to avoid delaying the condition and causing serious consequences.