Longdong coalfield was located in Longyao county of Hebei province, was found that the occurrence conditions of coal seams was relatively good in recent years, and buried shallow exploration area. In view of ordovician limestone water was the main threat in Hanxing area mining, its occurrence and migration regularity were important to mining in the area. Through the analysis of hydrogeological exploration results this stage, the coalfield ordovician limestone water occurrence and migration regularity research provided the basis for exploration and coal reserve base in the future.