Abstract: Guangrao County is rich in underground water resources, which is an important source of industrial and agricultural water for production and domestic use. And there are some geological environmental problems such as groundwater depression funnel, saltwater intrusion and land subsidence, due to the long-term large-scale exploitation of groundwater. Through the collection and analysis of the multi-year monitoring data of groundwater level, the authors in this paper have revealed the evolution law of groundwater level and predicted the change trend. The results show that the shallow groundwater depression funnel has been basically stable without aggravating trend under current mining conditions. Considering the developing trend of the land subsidence and saltwater intrusion, the authors have concluded that the restricted depth of deep groundwater is no more than 80 m, and the restricted depth of saltwater intrusion in Shimiao area is 10 m, which has provided the technical basis for the rational exploitation of local groundwater and the prevention of geological environmental problems.