Abstract: In order to solve the uncertainty in the evaluation of weighting grade evaluation of hard roof stope, based on the mechanical analysis, 14 index factors were selected from four aspects including roof condition, geological condition, mining condition and other condition.The subjective weight was determined by the order relation method, the objective weight was determined by the improved CRITIC method.The optimal comprehensive weight was obtained by using the game theory combination weighting.A cloud model for evaluating weighting grade was constructed in a hard roof stope.Through cloud similarity measurement, the accuracy of evaluation results was improved.Taking 11129 working face of Zhangji mining area in Huainan as an example, the weighting grade of 9-2 coal seam overlying hard roof was evaluated. The application results show that the proposed method comprehensively considers the subjective and objective factors of the evaluation object.The weight distribution is scientific and reasonable, the evaluation results are agree well with the actual situation, which could provide a theoretical basis for the field roof weakening operation.