The demand of coal was increasing day by day with the development of economy in China. Hence, the production capacity of coal mine was growing rapidly to meet the requirement of consumption, which promoted the social economy. However, the problems of hydrogeology in coal mines was becoming more and more serious and some of them threatened the safety of mining and workers. They had been one of the key factors of controling coal production. Therefore, the deep analysis of study hydrogeology during coal mining was of practical significance.