Preparation before operation: 1. Physician preparation: dress neatly and move quickly. 2. 2.Preparation of items: hard bed or hard board, gauze, 3.Environmental preparation: remove from dangerous environment, use curtain Method and procedure: 1.Determine patient’s consciousness: shake or pat the patient’s shoulders and call the patient loudly, while quickly checking whether there is breathing. 2, call for help: notify colleagues or physicians, take defibrillator. Watch the time. 3.Check pulse: ①Placement position: de-pillowed, lying position, place pressure plate. ②Unbuckle the collar and belt. ③ Judging the aortic pulsation: touch the carotid artery and judge the time for 5 to 10 seconds. 4, external chest cardiac compressions: ① operator position: located on the patient’s side, according to personal height and the patient’s position, choose to step on the foot or kneeling position. ② Positioning method: quick method – the midpoint of the line between the two nipples. ③ compression posture: overlap the palm roots of both hands, fingers do not touch the chest wall, the elbow joints of both arms straight, vertical downward force. ④Pressing amplitude: sternal subluxation at least 5M. ⑤Pressing frequency: at least 100 times/min. (6) compression and relaxation time 1U1, relaxation of the palm root can not leave the compression site. 5, artificial respiration: ① open airway: choose the appropriate method – tilt the head and lift the chin method, jaw method (if necessary, check the mouth, remove foreign bodies or denture) ② determine whether there is breathing: see, hear, feel, judgment time 5 ~ 10 seconds. ③ mouth-to-mouth, mouth-to-nose: pinch the nose – support the mouth – normal inhalation – blow – look up to see the thoracic rise and fall – normal inhalation – blow – look up to see the thoracic rise and fall . 6, compressions and artificial respiration ratio: 30U2. 7, the completion of five cycles, respiratory cycle, to determine whether CPR is effective, the judgment time 5 to 10 seconds. If not effective continue CPR, look at the time, and record. (Autonomic breathing appears, carotid artery pulsation can be palpated) Effectiveness evaluation: 1. Awareness of first aid. 2.Operate skillfully and correctly. 3.Caring and caring for the patient, reflecting the spirit of saving the life and helping the injured. 4.No complications.