After cerebral edema after brain hemorrhage, dehydration and cranial pressure-lowering treatment are given to promote the edema to subside, which usually lasts about 7-10 days. Early cerebral hemorrhage increases intracranial pressure due to the compression of surrounding tissues by the hematoma, which in turn causes cerebral edema. After the hemorrhage, the hydrostatic pressure in the hematoma cavity decreases due to the retraction of the hematoma clot, and the water in the blood further re-infiltrates into the brain tissue interstitial space, resulting in further increase of brain tissue edema. This process usually lasts about 7-10 days. If it is not corrected in time, it may result in more serious consequences and even endanger the patient’s life. Therefore, controlling hematoma enlargement at the early stage of onset is an important measure to reduce cerebral edema. Patients should try to control blood pressure and keep bowel movements smooth after brain hemorrhage, while avoiding emotional excitement and resting in bed are of great significance to avoid further expansion of hematoma.