Abstract: This paper presents an investigation on the solar cascade ejector system with cold and heat storage using the refrigerant R290/CO₂.The advanced exergy analysis method is utilized to analyze the interactions and optimization potential among the system components,and the effects of ejector component efficiency and CO₂side pressure of intermediate heat exchanger on system exergy performance are discussed.The R290 ejector has the largest avoidable endogenous exergy destruction and the highest potential for improvement,according to advanced exergy study results.Endogenous destruction accounts for 89.82%of the system exergy destruction,whereas the avoidable destruction accounts for 42.14%.The exergy efficiency of system can be effectively improved by increasing the ejector efficiency.There exists an optimal intermediate heat exchanger pressure to maximize exergy efficiency of system and minimize the avoidable endogenous exergy destruction of the R290 ejector.