Abstract: After the completion of Fankou Lead-zinc Mine curtain intercepting projects，groundwater flow field has been changed.In order to promptly grasp the ground water tendency and prevent from flooding accident，the automatic monitoring and pre-warning system for groundwater in the mine is developed to provide the scientific basis for the water conservancy project design.The system consists of 4 parts of data acquisition and transmission，data processing and analysis，groundwater dynamic early-warning and 3D visualization.The system carries out the real-time monitoring automatic statistics analysis and processing on the groundwater level，flow and water quality parameters，which can timely reflect the storage，transportation，supply and drainage characteristics and dynamic changes of groundwater to realize early warning.The application shows that the run state，data monitoring，and result output of the system accurately reflect the changes of groundwater flow in mining area，and the early warning is reliable.

Key words: Observation station, Monitoring system, Real time data, Threshold value of pre-warning, Visualization