In this paper, a micromeritics model is established to investigate the behavior of cylindrical particle dampers, and simulation is also carried out using Discrete Element Method (DEM) to study the effect of geometry and vibration level in different directions (vertical and horizontal) on the characterization of particle dampers. The research shows that when the dampers packed with the same amount of particles are vibrated vertically, the bigger inner diameter of container means particles convert from solid to fluid and gas more easily. And when the vibration level is low, the damper with a larger diameter has a better performance on the energy dissipation. The simulation results also show that the damper vibrated vertically can consume more energy than with the same vibration intensity in horizontal direction.