Cerebral edema usually reaches its peak 3-5 days after cerebral hemorrhage and gradually subsides around 7-10 days. Standardized and correct adjuvant treatment such as dehydration and hypotension can promote the decreasing of cerebral edema and shorten the duration of cerebral edema. The severity of cerebral edema varies depending on the amount of bleeding and the location of the bleeding. The peak of cerebral edema is usually within 3-5 days after cerebral hemorrhage, and the decrease of edema varies significantly with the severity of the lesion and the treatment. Clinically, the regression of cerebral edema generally starts around 5 days after cerebral hemorrhage, and may start around 3 days for small lesions, and basically subsides around a week to 10 days, with delayed regression of cerebral edema in severely ill patients. Intracranial pressure monitoring can be performed. Early edema volume correlates with hematoma volume and is the biggest factor affecting the prognosis of cerebral hemorrhage. Controlling cerebral edema can reduce the mortality rate of cerebral hemorrhage, reduce complications and improve the prognosis of patients with cerebral hemorrhage.