Abstract: In order to improve the shock-absorbing performance of a spring pendulum pounding tuned mass damper (SPPTMD), the parameters of the damper are optimized using particle swarm optimization (PSO). First, the mathematical model of the SPPTMD is derived, and a simulation analysis model of the system is established. Secondly, the SPPTMD optimization program is developed with the minimum structural peak response as the optimization objective by selecting the damper frequency ratio, internal resonance coefficient and collision gap as the optimization variables. Finally, the shock-absorbing effect of SPPTMD under 12 seismic waves on different sites before and after optimization is compared. The research results show that the optimal parameters of SPPTMD vary depending on the site condition where the controlled structure is located. After optimization, the shock-absorbing performance of the dampers has been significantly improved. Among them, the best optimization effect is achieved for the IV site.