Abstract: In order to master the roof failure structure and mine pressure development law of large mining height working face, the roof collapse laws of different mining heights are calculated and analyzed, and the reasonable working resistance of support is determined by dynamic load method. Principal results are as follows: the overhang area of the main roof of the large mining height face increases, and the mine pressure appears obviously; when the mining height is small and the direct roof is thick, the lower direct roof can fill the goaf after the collapse of the lower direct roof, while the upper direct roof is broken and acts as the bearing layer; the mine pressure on the working face is not obvious during the first and periodic pressure; by comparing the distribution law of plastic zone of surrounding rock with different mining heights, the lower direct roof caving is full of goaf and the upper direct roof cannot bear the weight of overlying strata bending and yielding under the action of tensile stress while the mining height is small; when the mining height increases to the point that all the caving of the direct roof is filled with goaf, the old roof forms a bearing structure, and the surrounding rock has fewer failure surfaces. In large mining height, the increase of the overhang area of the old roof causes the increase of abutment pressure in front of the coal wall of the working face, and there are many direct roof failure surfaces. The height of caving zone and fracture zone increased linearly with the increase of mining height; the ZY15000/33/72D hydraulic support was introduced to meet the production requirements according to the calculated working resistance of support.