Abstract: Major improvements to the new refrigeration system previously proposed are made. Removing the original heat exchanger bags and the serpentine pipeline make the system simplified. And transferring the contact heat with two different media into all-around mixed heat exchanger of the same medium can greatly improve the efficiency of heat transfer. The improved system need an exhaust machine and the related equipment based on the traditional air compression refrigeration device，in order to make a full circuit. Although the cost increases，the system becomes more simple and reasonable.

Key words: Heat hazard in mine, Air-compression refrigeration, Refrigeration roadway, Exhaust machine