Pacemakers are mainly classified as having temporary pacemakers and permanent pacemakers. For temporary pacemakers, in general, there are three indications: 1) emergency temporary pacing, mainly for cardiogenic syncope, cardiac arrest, post-cardiopulmonary resuscitation, pathological sinus node combined with A.S. syndrome, temporary pacemaker implantation can be given to ensure the beating function of the heart; 2) preventive pacing. For surgical procedures or temporary cardiac surgery, temporary pacemaker implantation can be done when the patient’s heart rate is slow to ensure the safety of the surgery; 3. Transitional, such as when the patient needs to undergo permanent pacemaker, pacemaker implantation, or heart bypass or major cardiac surgery, a temporary pacemaker is needed for transitional status, which can play a protective role This can be a protective measure.