Computational simulation was performed to analyze fluid flow and particle trajectories in a filter vessel with different location of an inlet including ceramic candle filters to remove dust particles from exhausted gas at high temperature and/or high pressure conditions. The inlet is located at the upper, bottom or middle position of centerline of the vessel. Computational results show that the particle deposition distribution is most uniform and the concentration of large particles is lowest on the filter surface in the filter vessel with the middle inlet among three inlets. Consequently, the amount of particles approaching filter surface may be reduced and the dust layer on the surface uniform when inlet flow does not directly contact with filters but is indirectly injected to a mixing region of the vessel.