Atrial fibrillation is one of the most common clinical arrhythmias, and although it occurs in every age group, this arrhythmia is most common in the elderly, why is this so? It is related to the pathophysiological changes in the elderly. The decrease in sinus node function, the increase in atrial fibrosis, the change in autonomic function of the heart, and the influence of external factors such as hypertension and coronary artery disease all contribute to the occurrence and S-holding of atrial fibrillation in the elderly; in addition, it takes some time for atrial fibrillation lesions to develop and deteriorate.