Abstract: TFE/NMP(2,2,2-trifluoroethanol/ N -methyl-2-pyrrolidone) is a new pair of working fluid,which is friendly to environment. A theoretical exergy analysis of a TFE/NMP absorption refrigerator based on the second law of thermodynamics is presented in order to find the link of the energy transformation process in this cycle. By analyzing influences of variation of parameters on the system’s COP and ECOP , the optimum parameters such as cycle ratio of solution, concentration of feed, and temperature of evaporator and condenser are determined. Meanwhile, the system’s COP and ECOP can be increased largely by adding the subcooler. The results obtained can be helpful to improving the system performance and make the design of the system optimum.