Abstract: Objective：To investigate the differences between the 2D mapping system (common X-ray exposure) and learning curve, radiation exposure, operation time and complications of 3D mapping system (Carto Univu) in radiofrequency ablation in treatment of patients with atrioventricular nodal reentrant tachycardia (AVNRT). Methods：The total radiation dose, total operation time, and surgical complications of radiofrequency ablation under the guide of Carto Univu (the Carto Univu group) in 70 patients with AVNRT were recorded during 6 months, and were compared with those of radiofrequency ablation under the guide of two-dimensional mapping technique (the 2D group). Results：There was no significant difference in the total operation time between the two groups. The total radiation dose in the Carto Univu group decreased compared with the two-dimensional group (P<0.05). The radiation time and radiation dose of the last 10 cases in the Carto Univu group were lower than the first 10 cases (P<0.05). There were no operation complications in the both two groups.Conclusions：In AVNRT, fluoroscopy integrated 3D mapping contributes to a dramatic reduction in learning curve and radiation exposure without prolonging operation time or increasing complications.