Cardiac arrest is a kind of acute and critical illness that may occur at any time and any place. It is sudden, unpredictable and time-dependent. In order to promote the national strategy of first aid for all, strengthen public first aid training, establish a multi-level open first aid dispatch system and implement the "Golden 4 Minutes" principle. The automatic external defibrillator AED developed by Amoul® has advanced ECG analysis, defibrillation and CPR quality feedback technology (metronome guidance), which can be reasonably arranged in a wide range. Multi-channel platform coverage can effectively shorten the time to obtain AED, improve its usage efficiency, and significantly improve the Return of spontaneous circulation (ROSC) of the patient.