Abstract: Mine water is a kind of ground water which gushes from the rocks during excavation. In the past, mine water is limited to the use of water sources itself. HEMS cooling system uses mine water as its cold sources for the first time. Taking Jiahe coal mine and Sanhejian coal mine as examples in this paper, the cooling of mine water is illustrated during the running of HEMS cooling system in deep mine. Practical appalication shows that the temperature of mine water which is used as cold sources could be controlled in 25~30℃, with the help of the technology of circulating by difference in level of mine water and the technology of circulating horizontally of mine water. It guarantees the normal operation of HEMS cooling system in deep mine.