Abstract: To solve the problems of various, non-linear, uncertain and cross-influencing evaluation indexes in predicting water inrush from coal seam floor, this paper proposes a coal seam floor water inrush prediction and evaluation method based on objective optimization combination weighting model is proposed for the defects of single objective weighting evaluation. The results show that the model can better reflect the characteristics of the main control factors, optimize the weight of the evaluation index factors in the objective weight model, and reflect the difference degree of the evaluation index factors to the largest extent from the objective and reasonable degree, and realize the quantitative scientific evaluation of the water inrush from coal floor.