Abstract: Yima coal field has an extra-thick hard rock strata, which is the main cause of many dynamic disasters in the mining area. Based on the mining face 21221 of Qianqiu mine in Yima coal field, Henan Province, China, this paper studies the movement characteristics of extra-thick hard roof during the advancement of working face by similar simulation and numerical analysis methods, carries out laboratory test on bursting liability of roof strata, analyzes the dynamic evolution law of collapse vertical displacement of extra-thick hard roof, and obtains the relationship between mining-induced stress and movement of the roof. The results show that: the failure of extra-thick hard roof could be divided into three stages: quiet period, stable failure period and collapse period. The vertical displacement of roof collapse changes a little during the quiet period, and is basically concentrated in the goaf during the stable failure period, showing a trapezoidal decreasing trend upward. However, it will develop rapidly upward during the collapse period. The movement law of extra-thick hard roof presents an unstable dynamic change phenomenon, that is separation, instantaneous subsidence, separation closure, intermittent stability, instantaneous collapse and compaction. With the advancement of the working face, the deformation and movement of extra-thick hard strata lead to the continuous and unstable subsidence pressure exerting on the stope. The structural instability of the extra-thick hard roof leads to severe mutation of ground pressure on the stope and sudden decrease of mining-induced stress, and that is an important inducement for the occurrence of rock burst.