In the light of the slight inferiority of the damping effect achieved by the nonlinear energy sink (track NES) under the pulse load optimization compared with that of the tuned mass damper (TMD), and with a view to further improving the damping performance of the track NES, an analysis has been made of the track NES and a research has been conducted on its effect on the damping performance. Simulation results show that track NES for seismic reduction can be improved by changing the track NES damping. With the structural stiffness of the primary structure having been altered, the robustness against the structural stiffness can be greatly improved by changing the damping of the track NES.