The seawater intrusion, as special environment caused by unreasonable development utilization of water resources at coastal areas, widely exists at home and abroad. In recent years, the phenomenon of groundwater over-pumping in Yantai City is increasingly serious and seawater intrusion problems also occur constantly. Further investigation of seawater intrusion status in Yantai city, analysis of correlation of seawater intrusion and over exploitation of groundwater, combined with the actual situation of Yantai City, explore the mode of groundwater resources utilization in seawater intrusion area. For the effective prevention of seawater intrusion, it has important significance to do the efficient development and utilization of groundwater resources well.