There are usually three ways to open the airway in adult CPR: 1) tilt the head and lift the chin; 2) tilt the head and lift the neck; 3) lift the jaw with both hands. The most commonly used method is the head-up chin-lifting method, which usually involves applying the piriformis muscle of one hand to press down on the patient’s forehead and then press downward, and then lifting up the patient’s lower jaw with the index and middle fingers of the other hand to lift up the lower jaw, which can achieve the effect of opening the airway. The second method of tilting the head and lifting the neck is to lift the patient’s neck with one hand, and then press the patient’s forehead with the piriformis muscle of the other hand, which is also able to open the airway. The third method of lifting the jaw with both hands is usually applied to patients who are suspected of having cervical spine injuries, in which case the cervical spine cannot be moved randomly, and it is usually done by using the thumbs and forefingers of both hands to make the patient’s bilateral mandibles open their mouths downward, and then the airway can be opened.