Sinus bradycardia has both physiological and pathological causes, and its treatment principles are as follows: i. If sinus bradycardia, if the heart rate is not lower than 50 beats/min, the patient does not need treatment if he/she has no symptoms. Second, if the heart rate is lower than 50 beats/min, you can use drugs to increase the heart rate when symptoms appear, such as atropine and isoprenaline. If a patient has significant sinus bradycardia with sinus arrest or even syncope, consider placing an artificial permanent pacemaker. Some patients are caused by organic heart disease, such as acute myocardial infarction, myocarditis, etc., so their primary underlying disease should be treated.