Abstract: A case study was performed in Xiaobaodang Coal Mine to evaluate the movement of the overlying rock and mining pressure under the condition of large mining height. Theoretical derivation,UDEC numerical simulation and on-site investigation were carried out at a 6.0 m mining height with thick hard roof working face to study the fracture pattern,the vertical stress distribution characteristics and change law of the overlying rock of the coal roof. The distribution law of the roof overburden pressure in the 112207 working face of Xiaobaodang No. 1 Coal Mine was studied,and the range of the influence zone of the coal wall support,the roof separation zone and the rear compaction zone of the fully mechanized mining face was analyzed through numerical simulation. The research results show that with the continuous advancement of the working face,the thick and hard roof forms a "masonry beam" structure,leading to an overlying rock "F"-shaped suspended roof,which generates high stress and a large-scale advanced supporting pressure zone in front of the coal face. The coal face support area of the working face is from the coal face to the front about 70 m. The roof separation area is about 50 m behind the coal face. The rear compaction area is from the coal face to 50 m into the goaf. The analysis of the mining pressure appearance of the thick and hard roof fully mechanized mining face is of great significance to the safe and effective production of the mine.