Cerebral hemorrhage in different periods and stages appears differently on magnetic resonance. In the hyperacute phase, that is, within 24 hours after cerebral hemorrhage, the lesion shows low signal in T1 and high signal in T2, which cannot be easily distinguished from cerebral infarction and edema; in the acute phase, 1-3 days after onset, it shows low signal in T1 and low signal in T2; in the early subacute phase, that is, 3 to 7 days after onset, it shows high signal in T1 and low signal in T2; and in the late subacute phase, that is In the late subacute stage, that is, 7 to 14 days after onset, T1 is high signal and T2 is high signal; in the chronic stage, ≥14 days, T1 is low signal and T2 is low signal. Since cerebral hemorrhage is an acute onset, non-traumatic intracerebral parenchymal hemorrhage, patients will have headache and hemiparesis soon after the disease. In case of larger bleeding, it can directly cause coma. After the onset of the disease, a cranial CT examination should be performed urgently to identify at a glance whether the patient is suffering from cerebral infarction or cerebral hemorrhage, instead of going for a cranial MRI examination.