For the 4 periods of cerebral infarction, they mainly refer to the acute phase, subacute phase, recovery phase and sequelae phase. Among them, the acute phase of cerebral infarction mainly refers to within 24 hours of onset, which is an acute phase of cerebral infarction, and there is a possibility of progression and aggravation of the disease. The subacute phase of cerebral infarction refers to within 72 hours of the onset of the disease, and the patient’s condition is relatively unstable, due to the possible occurrence of brain tissue edema and increased intracranial pressure after the infarction. For the recovery period of cerebral infarction, it mainly refers to the recovery period of cerebral infarction within 6 months after the onset of the disease. For the recovery period of cerebral infarction, if the patient is left with symptoms of neurological deficits, active rehabilitation treatment can be carried out. When the cerebral infarction has passed 6 months, it is the post-infarction period, and patients are advised to start secondary prevention of cerebrovascular to prevent the recurrence of cerebral infarction.