1.Judgment of consciousness: tap the patient’s shoulders with both hands and ask “Hey, what’s wrong with you?” 2, check respiration: observe the patient’s chest rise and fall for 5-10 seconds, tell him there is no respiration; 3, call for help, push the resuscitation cart, defibrillator; 4, determine whether there is carotid artery pulsation; use the middle finger and index finger of the right hand to scratch from the middle of the trachea to the proximal carotid artery pulsation, tell him there is no pulsation; 5, loosen the collar and trouser belt; 6, extrathoracic cardiac compressions; the midpoint of the line of the two nipples (the lower 1/3 of the sternum), use the left palm root to press against the patient’s chest, overlap the two hands, the left hand five fingers cocked. 3 at), with the root of the left palm against the patient’s chest, overlap the two hands, the left hand five fingers cocked, arms straight, press hard with upper body strength 30 times (pressing frequency at least 100 times/min, pressing depth at least 5cm); 7, open the airway, tilt the head and lift the jaw method. No oral secretions, no dentures; 8, artificial respiration: application of artificial simple respirator, each delivery of air 400-600ml, frequency 10-12 times / min; 9, continuous 2 minutes of high efficiency CPR, to cardiac compressions: artificial respiration = 30:2 ratio, the operation of 5 cycles; 10, determine whether the resuscitation is effective (listen to whether there is a respiratory sound, while touching whether there is a carotid artery pulsation); 11, organize the patient, further life support.