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The unreasonable and excessive exploitation of groundwater is the main reason to the water resource insufficiency in Tanggu. The decline of piezometric level is an obvious phenomenon, and three cones of depletion -50m,-70m and -110m has been observed respectively in the deep aquifer unit 2 to unit 4. The exploitation of groundwater also induces the occurrence of land subsidence, which is more serious in the low land area, and the maximum land subsidence has reached to 3.1m. A predication model to groundwater flow field is critical to the groundwater resource optimization and the suitable development of this area. This paper used a popular groundwater flow simulation system GMS to analyze the change of groundwater level under two different exploitation conditions. A forward simulation was done under the current groundwater withdrawal situation without optimization, and the other under the condition of the volume of groundwater extraction had a decline rate of 5% from 2009 to 2015. The simulation results show the measure controlled the volume of deep groundwater mining is useful to the discovery of water table.