Abstract: In the context of vigorous development of domestic oil and gas field upgrading and efficiency improvement, two high-efficiency ethane recovery processes were put forward: recycle split vapor with propane cycle (RSV-PC), and split heat-exchanging process with internal refrigeration and absorber(SHIA). Through HYSYS software simulation, the energy efficiency analysis and exergy analysis of the two improved high-efficiency processes were carried out. The analysis results show that under the same ethane recovery rate, the SHIA process saves 15.3% energy consumption compared with the RSV-PC process, and the energy saving advantage is obvious. By the method of exergy analysis, the difference in energy consumption between the two processes is that the main exergy loss difference between SHIA and RSV-PC is reflected in three devices: heat exchanger LNG-101, refrigeration system secondary compressor K-105 and external compressor the K-103.The total exergy loss of the three devices accounts for 76% of the total exergy losses of the respective processes.