It has been well known since at least the 1950s that chronic tachycardia can alter cardiac structure and func-tion. Atrial tachycardia (AT) is a common tachyarrhythmia originating from atrium which can be seen in patients with or without organic heart diseases. AT can occur as nonsustained, paroxysmal, incessant and chronic tachycardia. Ectopic automaticity, triggered activity and reentry may be the mechanisms of the arrhythmia. The classification of atrial tachycardia based on arrhythmogenic site and mechanism may be the better one for the purpose of clinical study and strategies of treatment. Currently available antiarrhythmic drugs have limited efficacy for acute termination of AT. Ibutilide can immediate terminate recurrent atial tachycardia after catheter ablation of atrial fibrilla-tion safety and effectively. Radiofrequency catheter ablation may be effectively performed under the guide of electroanatomic mapping in these patients. And, radiofrequency also can decrease stroke risk, improve ventricular function with a reduction in all cause mortality, cardiac and possibly arrhythmic mortality.