For the growing problem of mine heat hazard in the deep mining, this paper mainly studies the heat source and the rock temperature variation of the fifth mining in Pingdingshan. An air cooling system is designed using the low-temperature water spray, which operates as follows: the cryogenic water prepared by refrigeration unit is transported through the transmission pipeline to the cooler installed in the working face for cooling of the air flow; then the return water is transported back into the refrigeration unit for re-refrigeration cycle; the condensing heat which is generated by refrigeration unit is discharged by water spray in the shaft of Beishan, which is an effective solution to condensation heat emissions underground. To avoid the phenomenon of "uneven heat distribution with higher temperature on the upper position" during the long face cooling, the upper part of Mining Face is cooled by cold water spray shower, which is proved effective. Without the water spray working the temperature at the upper outlet of the mining face dropped by 2.8°C; and with the water spray working the working condition is improved by the temperature dropping for 4.8°Cat the upper outlet of the mining face while 4°Con the whole mining face and the air humidity content decreasing about 6 g / kg (DA). The research in this paper supplies valuable reference for the heat hazard control and recycling of mine wastewater.