Based on the analsis of the hydrogeological conditions of the survey region, the groundwater recharge and discharge quantity is calculated with water balance method. The result of calculation is negative balance. After groundwater mining, the water source being mainly from the increased recharge of the Yellow River. The pumping test and the numerical simulation show that the increased recharge of the Yellow River is 3.45×10⁴m³/d. According to water level forecast, after the water source being developed for 20 years or for 2 years running under adverse hydrological and meteorological conditions, the lowering of both water level is less than one-tenth of the aquifer thickness. This indicates that a mining rate of 3×10⁴m³/d is assured which can satisfy the water supply demand of the thermoelectric plant.