Abstract: Through the analysis of working face water filling conditions related to a mine having taken place super roof water inrush,this paper considered that the separated strata seeper from the influence of the repetitive mining action in thickly laminated sand was the main water filling source.The paper adopted experiential analogism and equivalent fracture method,the amount of working face water inflow was the sum of both normal water inflow and water inflow resulted from separated strata fracture seeper,in terms of the above,presented the theoretically computational formula of water inflow forecast,and forecasted the magnitude of resuming production water inflow in the virgin district of working face.The method checked by the actually mining action is basically feasible.