Abstract: Objective To study the effect of electrophysiological characterization and radiofrequency ablation on idiopathic right ventricular tachycardia. Methods Five patients ( 3 male and 2 female ) with an average age of 35.2±11.2 years were enrolled in this study. 7F EPT electrode in temperature-controlled mode was used for the ablation. The temperature and power were controlled within the range of 50-55 ℃ and 30-35 W respectively. The ablation target was the point that evidently induced P-potential at posterior right ventricular septum by scaling test. Tachycardia was stopped within 3 s. Consolidated discharge was within 40 s. The ablation was ended when the tachycardia could not be evoked during routine intracardiac electrophysiology test. Aspirin (0.1 g/d) was given orally for 1 month after operation. Results The body surface electrocardiogram did not change significantly after ablation. Neither S1S1 and program reed stimulation, nor intravenous drip of isoproterenol after operation evoked tachycardia. Neither tachycardia nor complication appeared 4-6 months after the test. Conclusions (1) Posterior right interventricular septum can also give rise to idiopathic ventricular tachycardia similar to left posterior interventricular septum. Ablation at the point where P-potential can be evidently induced by scaling test could easily acquire success. (2) Idiopathic right ventricular tachycardia has typical body surface electrocardiogram when tachycardia attacks. (3) Ventricular tachycardia is different from bundle brunch reciprocal ventricular tachycardia.