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Objectives To study the efficacy and mechanism of intravenous sotalol(Sol) for termination of paroxysmal supra-ventricular tachycardia ( SVT). Methods Sol or normal saline (NS) were administrated intravenously in patients with SVT induced by trans-esophagus left atrial stimulation. Results Conversion to sinus rhythm occurred in 65.2% (15/23) patients who received Sol (Sol group) at total dose of 1.5 mg/kg, the average conversion time being ( 10. 7 ± 11.6) min after the start of sotalol infusion. Conversion to sinus rhythm appeared in 4.8% (1/21) patients who were treated with NS (NS group). The efficacy between two groups was significantly different ( P ＜0. 01 ). The site of termination of tachycardia was predominantly at the antegrade atrioventricular node ( AV N ) in atrioventricular reentrant tachycardia ( AV RT ) (3/4) and at the retrograde fast pathway of AV N in atrioventricular nodal reentrant tachycardia ( AV N RT ) ( 4 / 6 ) . During the course of Sol infusion, both ventricular rate of SVT and systolic blood pressure ( SBP ) decreased. HR decreased from (173. 3±28. 4) min-1(before So l administration) to (159. 6-±-23. 8) and (152. 0±22. 2)min-1(3,5 minutes after the start of Sol infusion respectively, P ＜ 0. 01) and SBP from (16.31-±-2.27) kPa to (14.82±2. 61) and (14. 61-±-2. 60) kPa(P＜0. 01). Transient hypotension ( SBP ＜ 10. 7 kPa ) occurred in 2 patients during the course of Sol administration. There were no significant changes of HR and blood pressure in the NS group. Conclusion It was safe and effective for sotalo l administration on SVT.