Abstract: For the exploitation of the underground rich water deposit,the variation of groundwater flow field has become the important factor of restricting the safe construction and production of mine.How to accurately judge the variation of groundwater flow field is the great significance to the mine safety production.Combined with hydrological data of this mining area,and based on the bedrock fissure water system of the Huangmaqing group mixed silty sand rock,the numerical model of groundwater hydrology was established to analyze the variation of groundwater.The analysis results showed that the numerical model can describe the variation accurately.This method can be used as the important basis to ensure the safety of mine construction.

Key words: Baixiangshan iron mine, Numerical model, Groundwater flow field