Implement standard: AHA (American Heart Association) guideline for CPR CPR manikin feature: 1) Clearly anatomic characteristic, realistic touch feeling and lifelike skin color, vivid appearance 2) Simulate vital signs (a)Pupil state: contrast observation of pupils, one is dilated, the other one is contracted (b) Carotid artery response: simulate carotid artery pulse 3) Open airway 4) Can perform artificial breathing and external cardiac compression