The golden 4-minute resuscitation means that CPR given within 4 minutes of the onset of ventricular fibrillation or cardiac arrest can effectively restore the patient’s spontaneous respiration and voluntary circulation and save the patient’s life in time. If cardiopulmonary resuscitation is not given within 4 minutes, the probability of survival is low and the prognosis is poor. Therefore, immediate cardiopulmonary resuscitation and early defibrillation are the key to avoid biological death in cardiac arrest patients, and the first aid method is basic life support. Basic life support consists of four components: recognition of cardiac arrest, rapid activation of the EMS system, hands-only CPR, and defibrillation with an automated external defibrillator (AED) as soon as possible. It is especially important to do the first three steps properly because AEDs are limited and difficult to obtain in public places. First, after a patient is found to have fallen to the ground, forcefully tap the patient’s shoulder, call the patient, if there is no response, then touch the patient’s aorta, such as the carotid artery in the laryngeal node at the outer two transverse fingers, if it is not possible to touch the beat, indicating that the patient suffered a cardiac arrest, the need for cardiopulmonary resuscitation, the whole process of judgment needs to be completed in less than 10 seconds. The whole process takes less than 10 seconds to complete. After the judgment is completed, you should assess whether the surrounding environment is safe, and call others to help call the emergency vehicle, and then start the hands-only CPR. Secondly, CPR is to put the patient’s face upward, lying flat on the ground, unbuttoned, with the midpoint of the line between the two nipples as the pressure point, hands folded, vertical downward pressure, the depth of pressure required to be at least 5cm, the frequency of pressure is 100-120 times per minute. Pressing frequency is 100-120 times per minute. Pressing continuously for 30 times according to this standard, and then carry out mouth-to-mouth artificial respiration for 2 times, when artificial respiration requires that the patient’s airway is open, and clear the secretion of the oral and nasal cavity. The rescuer needs to pinch the patient’s nostrils to avoid leakage of air, and the duration of each blow is >1 second for 2 consecutive times. After 5 cycles of the above criteria, the patient is called again or his pulse is checked to assess his vital status. If there is no improvement, CPR is continued. Finally, if an automated external defibrillator is available, the electrode pads can be attached to the appropriate body part of the patient as instructed and the buttons on the defibrillator can be pressed as instructed. The defibrillator will automatically complete an ECG analysis and, based on the results, automatically decide whether or not to discharge the defibrillator. After defibrillation, it is necessary to continue chest compressions and repeat the above cycle until the arrival of professional ambulance personnel and equipment.