Abstract: In order to explore the influence of different mining-caving ratios on the mine pressure law of fully-mechanized thick coal seam working face, the 1303 working face of Zhaoxian Coal Mine in Shaanxi Province was taken as the research object.Through numerical model and on-site microseismic monitoring means, the influential range of advanced support pressure of roadway roof, the distribution characteristics of shallow-deep vertical stress of roof, the deformation speed of roadway surrounding rock, and the occurrence law of microseismic times under the influence of different mining-caving ratios were analyzed.The results show that the mining-caving ratio significantly affects the vertical stress distribution of the roof.When the mining-caving ratio exceeds 1∶3,the peak stress of deep roof increases by about 3 MPa, and the stress fluctuation is abnormal.Different mining height ratios only lead to differences in the deformation speed of the roadway, but the deformation speed of the roadway shows that the right side of the roadway>roof>left side; with the increase of mining height ratio, the distribution range of advanced abutment pressure and the number of micro-earthquakes in front of the working face is increased.However, the difference between the two is insignificant, which can meet the safety production.