Abstract:The roof rock mass with engineering rock mass quality of grade III and IV needs to adopt support technical schemes with different strengths due to the different failure characteristics and degree of surrounding rock. According to the technical scheme of combined support with anchor cable and bolt preliminarily selected for the roof of stope in different grades of rock mass, a numerical analysis model was established and several key monitoring points were selected to monitor the deformation, stress value, and plastic zone range in real time during the simulated mining process, so as to reflect the reinforcement effect. Through the comparative analysis of relevant monitoring parameters before and after stope roof support through numerical simulation calculation, the research indicated that the tensile stress value after stope roof support was about 35% lower than that without support, the maximum roof displacement can be reduced by 48.3%, and the range of roof plastic area after support was significantly reduced. The combined support of anchor cable and bolt can greatly improve the safety of goaf roof, well control the roof stress and displacement, and ensure the safety of operation in the stope. The research results can provide guidance for the selection of stope roof support scheme and the evaluation of reinforcement effect in similar mines.