AED defibrillator can recognize sudden cardiac arrest and malignant arrhythmia such as ventricular fibrillation in time and perform early automatic defibrillation to save patients’ lives. AED defibrillator can recognize cardiac arrest caused by malignant arrhythmia such as ventricular fibrillation and atrial fibrillation. After recognizing the arrhythmia, AED defibrillator can start defibrillating automatically to restore the normal electrical rhythm, saving the life of the patient who suffers from cardiac arrest, and fighting for the patient’s precious time to receive further resuscitation treatment. AED defibrillator is a portable rescue equipment, simple operation, can be used in large public places. AED defibrillator can save the life of cardiac arrest patients, automatically analyze the patient’s internal condition to decide whether to defibrillate, will not cause secondary damage to the patient, safe and reliable. It is recommended to familiarize yourself with the use of AEDs under the guidance of a physician, and to perform first aid when necessary, and to call 120 immediately while doing so.