Quinidine is very common in clinical work, it is mainly EA antiarrhythmic drugs can inhibit the autonomic contractility of the heart muscle, especially the autonomy of the ectopic excitation points other than the sinus node, can reduce the speed of conduction between the heart, prolong the effective period of inactivity, reduce the excitability of the heart, the prolongation of the atrial period of inactivity and more obvious than the ventricle, increase the frequency of conduction between the atria and ventricles. The main treatment is atrial fibrillation or atrial flutter. In addition, patients who have been unsuccessful after radiofrequency ablation can also be treated with quinidine for heart rate control and torsion.