[Abstract[已经根据中文重新翻译]] Objective To explore the feasibility and effectiveness of catheter ablation of Idiopathic Right Ventricular Outflow Tract Premature Ventricular Contractions (RVOT-PVCs) guided by CARTO3 electroanatomical navigation system. Methods 49 patients with RVOT-PVCs underwent catheter ablation were divided into two groups, 3D group using CARTO3 guide ablation (n = 29), the conventional group using X-Ray guide ablation (n = 20), compared two groups of operation time， X-ray fluoroscopy time, X-ray fluoroscopy exposure, cost,complication, achievement and recurrence rate. Results The immediate success rate in 3D group was 100% (29/29), in the conventional group was 95% (19/20); There were 3 cases of complications in the conventional group, but no significant complications in 3D group. Fluoroscopy time of CARTO 3 group was less than X-Ray group[ (1.3±3.6) min vs (44.2±28.2)min,P<0.01], with a correspondingly low radiation exposure[(93±242) mGy vs (3 919±2 309) mGy, P<0.01]. There was no statistically significant difference in total operation time of two groups.In 20/29 (69.0%) RVOT cases, electroanatomical mapping avoided fluoroscopy entirely. Conclusion Our study shows that using 3D electroanatomical navigation system (CARTO 3 system) in RVOT-PVCs ablation is effective and safe,it can markedly reduce fluoroscopy exposure.In many cases, non-fluoroscopic RFCA is feasible.