Abstract: Objective To investigate the role of transesophageal atrial pacing in diagnosis and specific typing of paroxysmal supraventricular tachycardia(PSVT),thus provide assistance for further radiofrequency ablation. Methods Total 61 cases of PSVT induced by transesophageal atrial pacing were studied by determining R-P'E and P'E-R interval of esophageal lead,R-P' interval of Vl lead,and direction of P',all of which were compared with the results of radiofrequency ablation. Results ①In line with the results of radiofrequency ablation,the types of PSVT among the 61 patients were as follows:25 cases of AVNRT(slow-fast type),1 case of AVNRT(fast-slow type),24 cases of O-AVRT(left-sided accessory pathway),7 cases of O-AVRT(right-sided accessory pathway),1 case of O-AVRT(double pathways),and 3 cases of atrial tachycardia.②Among the 61 cases,those whose R-P'E<70 ms were all AVNRT(slow-fast type),those whose R-P'E>80 ms were mostly O-AVRT,those whose R-P'EP'E-R were mostly atrial tachycardia.③Those cases whose V1 lead R-P'>R-P'E were all left-sided accessory pathway,and those whose V1 lead R-P'Conclusion Transesophageal atrial pacing has high clinical value in typing of PSVT,developing treatment programs and providing assistance for further radiofrequency ablation.