The medical name for a cerebral infarction is ischemic stroke, which has a good prognosis in mild cases and is life-threatening in severe cases. Thus, if a brain infarction patient is found around, immediate first aid is needed. If a brain infarction is confirmed, first aid can be administered in the following ways: 1. Environmental preparation: If a brain infarction occurs outside the hospital, the 120 emergency number should be called immediately. Before the arrival of medical personnel, the patient should be moved to a safer and spacious site to ensure air flow and facilitate rescue treatment; 2. Keep the airway open: place the patient in a depillowed supine position, elevate the jaw and tilt the head to the side. If you have a denture, help to remove it, clean the airway, keep the airway open to prevent accidental inhalation; 3, cardiopulmonary resuscitation: check the patient’s vital signs, if found unconscious, breathing, cardiac arrest, cardiopulmonary resuscitation should be given immediately, that is, chest compressions and artificial respiration, to prevent missing the best time to save, to buy time for the arrival of medical personnel; 4, oxygen: if available, such as spare oxygen cylinders or oxygen bags at home. Oxygen should be administered to the patient as early as possible to maintain oxygen saturation and assist in rescue treatment; 5. prevent posterior tongue fall: if a brain infarction patient has a convulsion, the environment should be kept quiet and dimly lit, and the tongue should be compressed with a tongue depressor or a spoon to prevent biting the tongue or the occurrence of posterior tongue fall; 6. other: after admission, the patient needs to perform oxygen saturation monitoring and cardiac monitoring immediately. If the patient’s body temperature is >38℃, antipyretic treatment should be given. In addition, patients need to control blood pressure and blood glucose for follow-up treatment.