Abstract: At present, the packing or sieve tray is widely used in the LPG extraction tower of the alcohol amine purification unit. This paper focuses on the design of packing tower and sieve tower. For the packing tower, the packing height, tower diameter, distributor, redistributor calculation or estimation methods were given, and the minimum amine to LPG flow ratio required by random packing and structured packing was provided. For the sieve tray tower, the methods of calculating or estimating the sieve hole diameter and the velocity through the holes, the operating linear velocity of dispersed phase, the tray spacing and the tower diameter were given. The typical dispersed phase feed setting mode and the structure of the sieve tray column dealing with low volume flow ratio of two phases were also provided. A comprehensive feed treatment measure for LPG extraction tower was put forward, which is the LPG coalescer was used to remove the water-soluble harmful substances from LPG, and a filtration system, including primary filter, activated carbon filter and secondary filter, was installed to remove impurities from the lean amine pipeline. It was pointed out that activated carbon filter could effectively adsorb soluble organic pollutants dissolving in amine solution. The suggests were as follows: (1) the amount of lean amine treated by activated carbon filter was 15%-25% of the total amount of lean amine circulation rate; (2) the residence time of amine solution in the bed of activated carbon should not be less than 15 minutes; (3) the activated carbon filters were designed according to one for operation and one for preparation.