Abstract：The key strata control the process of the overlying strata movement and the dynamic expanding of the mining-induced fracture in coal mining stope，and then it will influence the gas dynamic emission of the adjacent layers in the mining-induced fractured rock mass. Based on the in-situ data of two fully-mechanized top-coal caving faces in different overlaying strata in Yangquan Coal Mines，the influences of key strata movement on the gas dynamic emission of the adjacent-layers are comparatively studied. The results show that the dynamic processes of the gas emission of the adjacent-layers in the different overlaying key strata are different，which has further verified the dynamic control of the key strata on the gas emission of the adjacent layers. The applicability of the gas extraction way of the adjacent layers in different overlaying key strata at the initial mining stage is also analyzed. It is put forward that，in order to improve the gas extraction efficiency，the actual overlaying key strata should be considered before the decision of the gas extraction way of the adjacent layers at the initial mining stage.
