Abstract: In order to research mine pressure behavior in the fully mechanized coal caving face in extra thick coal seams, the 40201 working face of Xiaozhuang Coal Mine was used as the background, and the damage characteristics of the roof of the mining face were studied by numerical simulation, combined with the work surface along the inclination and the working resistance monitoring of the hydraulic support. The analysis and comparison of the working resistance of the bracket determined by the empirical formula show that the weighting interval of the 40201 working face fluctuates between 33.6m and 46m, the average weighting length is 21.0m, and the mining influence coefficient averages 1.42. The top plate load of the working face determined by the formula is 0.94 MPa, which is less than the working support strength of the support 1.28 MPa; the ZF13000/21/40 bracket used for the 40201 working face meets the production demand.