[en] A 2 x 250 MWth High temperature gas-cooled Pebble Bed Modular reactor (HTR-PM) is under development in China. The work being performed includes design and safety analyses. High temperature gas-cooled reactor (HTGR), especially the pebble-bed core type reactor, will inevitably cause the wear the graphite components and generate graphite dust during operation. The graphite dust is taken away by helium coolant and deposited throughout the primary system. Furthermore, the dust will become radioactive due to sorption of fission products released, although in very small quantities, during normal operation. Since it is possible that the fission products are released with dust under the accident conditions such as depressurization events, they have a potential hazard of radiation exposure to the environment. This paper presents a model and analyses of the dust transport in HTR-PM. The purpose of the work is to estimate the amount and distribution of deposited dust during plant life time, which was assumed to be 40 full-power years. The result will lay the foundation for further studies of fission products releasing and interaction with dust under accident conditions. (authors)