The effects of rapid-type atrial fibrillation on the body are mainly manifested in the following aspects: first, due to the increase in ventricular rate, it can induce ischemia of the myocardium, and if the patient’s age is higher, it may induce the symptoms of angina pectoris. Due to the increased heart rate, patients with poor basal cardiac status may develop congestive heart failure or worsening of heart failure symptoms. Because of the loss of effective systole and diastole due to the disorganized fibrillation of the atria in atrial fibrillation, cardiac blood output will be reduced by more than 25% from normal. Secondly, due to the loss of effective contraction of the atria in patients with atrial fibrillation, thrombus occurs in the atria due to hypercoagulability. The biggest risk for patients with atrial fibrillation is embolism, which can increase the risk of stroke and other diseases, and the main treatment is to correct the primary cardiac disease, anticoagulation, reversion to sinus rhythm, and control of the ventricular rate.