Abstract: The 12401 fully mechanized mining face of Shangwan coal mine of Shendong mining area is the world's first 8.8m large mining height working face. According to the actual measurement, the law of mine pressure appearance was summarized, and the applicability of the support was also evaluated. The results show that the initial pressure distance of the fully mechanized mining face is 45m, and the pressure is relatively large; the periodic pressure shows obvious continuity and phase, and the periodic pressure distance increases from an average of 10.05m to an average of 12m, and then rises to an average of 16.4m; the cycle of alternating pressure distance gradually appears, and the pressure intensity also has an alternating size; as the mining distance increases, the number of large distances increases, the number of strong pressures increases, and the mine pressure becomes stronger; when the mine pressure appears severe, there is indeed a case where the estimated working resistance exceeds the working resistance of the selected supports, but the number is not much, the opening rate of the safety valve is low, and the reduction of the living columns is small, so the selected supports can meet the needs.