The effects of temperature on the filtration efficiency and pressure drop of a dual-layer granular bed filter were investigated in a hot dual-layer granular bed filter with experimental dust. Enhanced higher filtration efficiency was obtained with higher filtration temperature, and the removal efficiency of ultrafine dust was also at a high level. Simultaneously, the total pressure drop maintained at an acceptable range. The results demonstrate that the dual-layer granular bed has excellent prospects for application to low-temperature coal pyrolysis.