Dust collection by an annulus granular bed filter consisting of a double packed column, having large diameter granules outside an inner tube with multiple holes in the wall for dust gas in-flow, and small diameter granules inside the outer tube with multiple holes for gas out-flow, was carried out experimentally to examine a new functional filtration method. The filter granules and fines used were glass beads and fly ash, respectively. The same high collection efficiency as a single packed bed of small granules of I mm diameter, but lower pressure loss of less than one-half could be attained with the double packed column with a suitable combination of granule diameters of 3 mm and 1 mm. The dust collection model proposed previously was also fairly applicable to represent the experimental results and was considered to be useful for designing the functional annulus granular filter.