The liquid body distribution device is arranged at the top of the packing tower. Its function is to make the liquid in the tower cross and uniform distribution, so as to ensure the operation. Commonly used operating distributor are: shower head type, impact type, pagoda type, porous row tube type, porous coil type, overflow disk type and overflow groove type. When the spray liquid flows down along the packing layer, it can not keep the original uniform distribution state, and has the phenomenon of flowing to the wall of the tower, which affects the contact between f gas-liquid phase and reduces the mass transfer efficiency. Therefore, the packing layer must be segmented, and the liquid redistribution device is arranged between the two packing layers to make the liquid flow evenly to the lower layer.