Similarities and differences of filtration performances of granules were investigated in two beds of ceramic balls and quartz sands. The results showed that the filtration performances of two kinds of granules with similar mean diameter and steady-state filtration pressure drop except for shape and surface condition were basically identical. The filtration efficiency increased at first and then decreased with increasing dust mass deposition (?m), while the deviation degree of pressure drop with steady-state pressure drop (correcting factor, G) presented an increasing trend. The filtration efficiency and G decreased with increasing superficial gas velocity for the same ?m, but G at high superficial gas velocity would be close to G at low superficial gas velocity during the later period of filtration operation. Although there was no significant change in total filtration efficiency, the grade filtration efficiency of dust particles bigger than 0.7 ?m increased when inlet dust concentration increased. At the same time, G under the condition of higher inlet dust concentration was larger. The most penetrant dust particle size was in the range of 0.35~0.6 μm for these two kinds of granules. However, certain differences also existed in filtration performances of these two kinds of granules because of different shape and surface condition. Other conditions being equal, the total and grade filtration efficiency of quartz sands were higher than ceramic balls, and the G of quartz sands was also larger. In addition, the filtration efficiency of quartz sands varying with ?m changed very little with increasing of inlet dust concentration.