Hydrogeological evolution and three-dimensional numerical modeling were investigated in an urban area of Beijing. The main conclusion illustrate that hydrogeochemical modeling, geological statistics and spatial analysis on GIS can be applied to jude and measure the anthropogenic influence on the chemical composition of groundwater, as was assessment of stable isotope ratios approach in combination with chemical and hydrogeological data revealed that wastewater is the prevailing source of nitrogen. Moreover investigations using laboratory columns and field observations revealed that clay...