The steps of adult CPR are as follows: 1. determine whether the patient is in cardiac or respiratory arrest, if the patient suddenly loses consciousness, unconsciousness called, check the breathing no or just sigh-like breathing, no need to determine whether there is a heartbeat, you can determine that the patient is in cardiac or respiratory arrest. 2. immediately call the 120 emergency number, and call others to help. 3. start CPR, first chest cardiac 30 compressions, frequency 100-120 times / min, quickly clean the patient’s mouth and nose secretions, vomit, foreign bodies and movable dentures, open the patient’s airway by pressing the forehead, lifting the chin and chin, mouth-to-mouth artificial respiration, calmly inhale a breath to the patient’s mouth blowing air, you can see the thorax rise and fall, artificial respiration twice, followed by 30 compressions, blowing air twice, and then press 30 times, blowing air twice. The ratio is always 30:2. 4. After five rounds of compressions and blowing, quickly determine whether the patient has recovered breathing and heartbeat, and if not, continue to repeat the above resuscitation process until the arrival of professional emergency personnel.