Because bio-trickling filter has superiority on elimination of H_2S, it has been a hotspot at home and abroad. In bio-trickling filter, filler is not only a carrier by microorganism growing, but also a medi-chemical transmitter in the gas-liquid, and it is a core of the set. The bio-trickling filter's improve mostly depends on the fillers development. This paper study elimination of H_2S by bio-trickling filter, we choose ceramisite, cascade ring, ceramic ring, ferrule, shale ceramisite as fillers fo...