The　moving　granular　bed　filter　is　one　of　the　most　promising　hot　gas　dust　removal　devices　for　integrated　gasification-combined　cycle　(IGCC)　and　pressurized　fluidized　bed　combustion-combined　cycle　(PFBC-CC).　The　flow　pattern　of　moving　granular　bed　is　studied　with　the　fluidization　theory.　It　is　found　that　the　structures　of　filter　and　media　circulation　system　have　considerable　influence　on　the　filter　performance.　The　pressure　gradient　on　granular　layer　is　the　main　factor　affecting　the　flow　pattern　and　pressure　balance　between　gas　streams.　A　moving　granular　bed　filter　system　is　fabricated　and　tested　in　a　pilot-plant-scale　gasifier.　On　account　of　a　great　deal　of　vapor　in　hot　coal　gas,　the　operating　scheme　is　made　to　prevent　vapor　condensing.　The　experimental　results　show　that　the　pressure　balance　between　different　currents　is　more　easily　obtained　than　in　the　old　system.　Moving　granular　bed　filtration　and　granular　medium　regeneration　can　be　carried　out　steadily　in　the　condition　of　hot　coal　gas.　The　overall　collection　efficiency　is　high　up　to　99.65%-99.80%,　but　the　grade　efficiency　of　fine　particles　should　be　improved　further.