Ceramic cascade rings own all the features of the raschig rings.Its height and diameter ratio is 1 to 2, as for the improvement of the pall rings,add the cone-shape turnup at one side, decrease resistance when fluid pass through the bed layer, and add the flux, high packing strength.Due to these features, the gas and liquid well-distributed.Enlarge the gas and liquid covering area and then improve the mass transfer efficiency.