Abstract: In order to make clear the hydrogeochemical characteristics of each aquifer, especially for the main mining seam (2-1 coal) Jurassic aquifer influenced by water disasters in Hulusu Coal Mine, hydrogeochemical data of each aquifer was used to carry out reach. The results showed that the groundwater system of Hulusu Coal Mine could be divided into three main solid systems. These aquifer systems were as follows: Quaternary unconsolidated rock porous aquifer, Cretaceous porous-fractured aquifer and Jurassic sandstone fracture aquifer. There was a positive correlation between the concentration of total dissolved solid (TDS) and the depth of aquifer. The concentration of TDS increased from <500 mg/L to 5 700 to 7 800 mg/L gradually, and the processes of water chemistry type were as follows: HCO₃-Ca·Mg→HCO₃-Na→SO₄-Na→SO₄·Cl-Na.