Abstract: The condensing separation method can be used to recover light hydrocarbon from gases separated at different stages during the process of crude oil stabilization and collection,or recover gas condensate from natural gas.Its technological process mainly consists of the operating units of supercharging,purification,freezing,condensate fractionation,etc.Taking the technology of light hydrocarbon recovery for the oilfield gas of an oilfield as an example,the four units mentioned above are studied in this paper,and the optimized design and operation of modern towers is approached as a key.