Abstract: Insufficient heat exchange area and too slow cooling water brought about low heat exchange efficiency of the CO₂ recycling and cooling system in dry-ice expanding cut tobacco system. The system's working principle was analyzed, and a heating exchanger and a pipe line pump were added to increase the heat exchange efficiency of the system. After improving, the temperature and pressure of CO₂ decreased, the CO₂ pressure was controlled within the set values, the load of CO₂ compressor was reduced, and the waste of CO₂ was avoided accordingly.