Valid indications for chest compressions are the development of physiologic reflexes after CPR, and the patient’s transition from unconsciousness to agitation after CPR. The patient’s spontaneous respiration is restored, dilated pupils are narrowed, and the light reflex is restored. The patient’s peripheral circulation is improved, such as lips, face, skin, fingertips, from pale to red, and the patient’s systolic blood pressure reaches more than 60mmHg. In addition, the beating of the patient’s large arteries is restored, mainly the carotid artery and femoral artery activity is restored. When cardiac resuscitation must be careful to check whether the patient has a pulse, if found to have no pulse, chest cardiac compression should be carried out immediately.