Abstract:Abstract: The actual production process of the mine, the amount of water surge is accurately predicted with important significance. In order to solve the problem of numerical prediction is not accurate enough, this paper uses the big well method and GMS numerical simulation method to carry out a mine pit surge water double prediction comparison analysis. The use of groundwater dynamics "big well method" of the pressurised to unpressurised formula: derived from the maximum drop depth average surge of 47,948m3/d, the minimum drop depth average surge of 46,501m3/d; the use of GMS numerical simulation software derived from the pit average surge of 32,000m3/d, the maximum surge of 38,000m3/d. The two results were compared and analysed and the following conclusions were reached: the prediction formula of the large well method is derived under the strict conditions of aquifer level, equal thickness and homogeneity, but the mine actually does not fully meet the prerequisites of the formula, and its prediction results will be large; the numerical simulation method is highly adaptable and has been applied to a large number of aspects with high prediction accuracy, and the data derived from this method will be more accurate than that of the large well method. The numerical modelling method is highly adaptable and has been used in a number of ways, and the data derived from this method will be less extensive and more accurate than that derived from the large well method. The dual prediction method yields a large and small range of predicted values for the pit's water influx, and the results show that the pit's water influx is indisputably large, and the research results will be used as technical support for the mine.