By building the factor index system and getting nine main factors through the grey correlation, the contribution weights are ascertained by the entropy adjustment. According to the grey matter-element analysis theory, it builds the linear grey matter-element and optimal grey matter-element model respectively, the discrimination system of combined grey matter-element for water outburst in seam floor of deep mines is exploited by VB 6.0. The two module in parallel operation and mutual verification can much raise the result precision, it is basically capable of forecasting deep seam mining faces.