Behavior of particle in a glow discharge plasma was evaluated. Transient charging of a particle suspended in a glow discharge plasma was estimated by solving the orbital motion limit model equation, which includes the correlation between the surface charge induced by ion and electron fluxes and the surface electric potential. The glow discharge plasma was described by continuous plasma model, which employs the conservation equations for electron and ion. The trajectories of particle in the

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... a were obtained by solving the equation of motion for the charged particle in the plasma field, which takes into account the external forces of fluid drag force, gravitational force, electrostatic force and ion drag force. Calculation results showed the particles are effectively trapped in the boundary region between plasma bulk and sheath. Larger particles are more stably trapped than smaller ones, since the larger particles undertake the electrostatic force and ion drag force more effectively.