Abstract: Objective:To investigate the early diagnosis and treatment on the QT-interval prolonging with Torsade de pointes in the patients implanted pacemakers.Methods:Analying the causes,functions,clinical conditions and electrocardiogram changes for the 6 patients in the article. Results:3 cases typical and 3 cases no typical LQTs-TdP in 6 saved patients,5 cases of which were successful and 1 case failed. Conclusion:The patient implanted pacemaker with synocope episode should be warned having the LQTs-TdP.