When the patient suddenly falls to the ground and loses response, and loses breathing or enters the state of near-death respiration, the AED can be turned on and the patient can be given first aid according to voice prompts, the steps include: 1, confirm the patient’s status: including whether to lose response, loss of breathing, etc.; 2, open the patient’s clothing to expose the chest, and according to the logo will be electrode patches attached to the appropriate location; 3, AED analysis of heart rate: avoid touching the patient, so as not to interfere with the analysis of heart rate; 4, when the heart rate analysis results in ventricular fibrillation, the AED is charged, and after charging is complete, press the orange button for defibrillation, the patient shows instantaneous shaking of the whole body, after which CPR needs to continue.