When the butterfly rings are stacked in the tower, the overlapping and nesting phenomenon occurs along the axial direction. The inner rib structure is conjugate shape and is very uniform in the tower, so the liquid is evenly distributed on the filler surface. The inner rib of the adjacent filler has more points in contact with the surface, which can accelerate the accumulation and dispersion of liquid and the surface renewal. These characteristics make the butterfly ring to the fluid resistance is small, but provides the gas, liquid phase contact surface is large, thus has improved the packing hydrodynamics and mass transfer performance. Therefore, the butterfly ring packing is a kind of packing with large flux, low pressure drop, high mass transfer efficiency and large elasticity.