Objective To observe the long-term change of parameters of active-fixation lead and to explore its stability. Methods Totally 124 patients 67 males,mean age (69±9) yearsreceived implantation of the permanent pacemakers and the active-fixation leads (1 atrial active-fixation lead,124 ventricular active-fixation leads) from Jan,2006 to Aug,2007. The implantation sites were as follows: 1 in the right atrial appendage,66 in ventricular septum,58 in ventricular apex. The parameters were recorded immediately,1-month,3-months,6-months and 12-months postoperatively. Results The pacing thresholds increased during operations and decreased 1 month postoperatively. There was significant statistical difference between the two time points. There was no significant difference between time points of 1 month,3 months,6 months and 12 months postoperatively. The sensitivity was not significantly different between all time points. Impedances increased during operation and decreased postoperatively. The pacing thresholds increased in 2 patients (1.6%) 6 months after operation.Conclusion The active-fixation lead is more stable than passive-fixation leads,and the dislocation rate of active-fixation lead is comparatively lower. The incidence of threshold rising is low (1.6%),and the pacing parameters are stable postoperatively.