Abstract: In view of the problem of strong mine pressure in full-mechanized caving face with large mining height in ultra-thick coal seam during the final mining period, based on the support working resistance and the field microseismic monitoring data, the mine pressure behavior and overburden activity rule of the full-mechanized caving face with large mining height during the final mining period were studied.The results show that: The periodic weighting during the final mining period of full-mechanized caving face with large mining height are characterized by frequent weighting, long weighting duration and weighting steps, and strong dynamic load mine pressure.During the final mining period of full-mechanized caving face with large mining height, the strike rupture lag distance of the roof strata is obviously shortened, and the energy of the top strata tends to concentrate towards the center of the face.There is an obvious correspondence between the microseismic frequency and energy and the weighting of the working face.The periodic weighting of the working face can be predicted according to the abnormal changes of the microseismic frequency and energy.