Thrombolysis is an effective treatment for cerebral infarction, but there is a clear time window for thrombolysis, and intravenous thrombolysis should not be performed after 6 hours. The shorter the thrombolysis time, the better the effect of thrombolysis, if more than 6 hours, the effect of thrombolysis will not be too good, and the risk will be increased, because thrombolysis may lead to cerebral hemorrhage, which is fatal for the disease. Therefore, thrombolysis should be performed within 6 hours. In general, rt-PA can be used for intravenous thrombolysis within 4.5 hours of the onset of the disease, and urokinase can be used for intravenous thrombolysis within 4.5-6 hours of the onset of the disease. Thrombolysis must be applied only with the informed consent of the family, and the contraindications and indications for thrombolysis must be strictly controlled to avoid cerebral hemorrhage, which may endanger the life of the patient.