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Ejector refrigeration system has been used usually because of its simple configuration with no moving parts. Ejector is crucial part of ejector refrigeration system. Design of ejector sturdily affects the performance of refrigeration system. Available past and present literature and up to date information on in ejector refrigeration system were studied. To analyze the effect of exit nozzle position (NXP) on the ejector performance Some of researches have carried out experiments and paid attention 0n selections of working fluid, mathematical modelling, geometrical and operation conditions of ejector, the enhancement of cooling performance. However, most of the experimental studies which have been done in last few years are still inadequate when compared with simulation and experimental results. However, a lot of research work is still required for large-scale applications of ejectors in industry.