Catheter ablation is a technique recently established and employed as a curative therapy for arrhythmias especially junctional tachycardia. Junctional tachycardia is a rather common affection, but underestimated because of rarely occurring episodes of tachycardia or atypical onsets. Reentry is the mechanism of all junctional tachycardia. Atrioventricular nodal reentrant tachycardia is the most commonly encountered form, atrioventricular reentrant tachycardia (via accessory pathway) is less common. Paroxysmal tachycardia is the most common form, chronic forms are rarely encountered. The clinical manifestation and the prognosis of these tachycardia are very variable from one patient to another, and can be a benign or a serious problem, according to the frequency of tachycardia and the age of the patient. In the acute setting, vagal manoeuvers and pharmacologic therapy can be efficient in arrhythmia termination. Exceptionally, we have resort to direct-current cardioversion in the hemodynamically unstable cases. The indications of a curative therapy, by antiarrhythmic drug or catheter ablation, vary depending on the occurrence frequency and the gravity of the crisis. A curative therapy is indicated in order to avoid the recurrence of crisis. In general, catheter ablation is used as a second line therapy after an inefficient or poorly tolerated pharmacological treatment. The most commonly used energy in catheter ablation is radiofrequency. The cryoablation represents an alternative form of energy delivery, and s usually used in form of junctional tachycardia at high risk of atrioventricular block. Other energies exist, but are still under evaluating. The catheter ablation is based on the principle of interruption of one limb of the reentry circuit who is previously identified by electrophysiological testing. The low complication and high success rates (between 91 and 99 %) reported by the literature have made the catheter ablation therapy a reference treatment of junctional tachycardia