Abstract: Based on the supplemental rectification with compression(SRC) process for ethane recovery, an improved and energy-saving process on rich gas is proposed in this paper. Six kinds of rich gas in domestic are selected as basic data, and economic and thermodynamic analysis methods are used to comprehensively compare and analyze the recycle split vapor(RSV) process and improved process of SRC (SRCR). Under rich gas conditions, the comparative analysis results show that: (1) The geometric structure of the plate-fin heat exchanger inside the cold box greatly affects its investment cost, and under different feed conditions, the structure of the plate-fin heat exchanger inside the same cold box is basically the same with a slight difference; (2) Compared with the widely used RSV process, the operating cost of SRCR process is reduced by an average of 4.38 million dollars per year, and the energy saving potential is obvious; (3) The financial net present value(FNPV) under the operating conditions of the SRCR ethane recovery project is greater than zero, which can meet the benchmark yield requirements profitability, the net profit of project investment is relatively large; (4)Under different rich gas conditions, SRCR process shows good adaptability, and different feed conditions, the energy-saving effect is different.