Abstract: The hydrogeological conditions of Kouquangounan region in Datong Mining District are analyzed By use of environment isotopes such as hydrogen,oxygen,uranium,sulphur,carbon and so on,the relationship between Kouquangounan and adjacent Shentou and Sancendong spring fields,and the recharge source of underground water are studied With the finite element method,the underground water evaluation and the water level prediction are conducted The possibility to establish a 10 000 m³/d water supply in this area is proved.