Gas insulated metal enclosed transmission line(GIL) is alternative to cable and overhead line because of its large transmission capacity, small floor space and low transmission loss. Metal particles of GIL will take off under electric field, which threatens the insulation performance of GIL. To better collecting metal particles, it is necessary to investigate the force analysis and motion characteristic of metal particles of GIL. Firstly, the force and motion characteristic of metal particles between coaxial cylinder electrodes is analyzed, under the condition that the influence of the basin-type insulators on the axial electric field strength is ignored. The resonant frequency of metal particles is used to characterize the activity of metal particles under DC voltage, and the influences of voltage and particle radius on the resonant frequency of metal particles are analyzed. Then, considering the influence of the basin-type insulator on the axial electric field intensity of GIL, several typical motion trajectories of metal particles are obtained. Finally, some suggestions for the layout of particle traps are given. The results show that it is necessary to arrange metal particle traps under the convex side of basin-type insulator.