Abstract: In order to control water (gas) outburst and other serious secondary disasters caused by the overlying hard strata sudden rupture at stope，the hard strata rupture law of overlying integrated moving belt in a coal mining face with continuous and large mining was studied.Based on study of the geological engineering conditions in a first coal mining face，such as overlying strata spatial occurrence，rock mass structure，mechanical properties and in-situ ground stress etc，the initial rupture and cycle rupture distances of the hard igneous bedrock at stope overlying integrated moving belt at first and subsequent working face were calculated and simulated by using thin plate theory and numerical simulation methods.The results showed that the initial rupture distance of hard igneous rock at first working face was about 300 m and the cycle rupture distance was about 130 m.Because the subsequent work mining was affected by the goaf of adjacent mining face，its initial rupture distance was about 260 m and cycle rupture distance was about 120 m.The results are in accordance with the field data analysis.Research results have important significance to predict and control water inrush and gas outburst in bed separation and other geological disasters resulted from coal mining under hard strata.

Key words: Hard roof, Thin plate theory, Numerical analysis, Initial rupture, Cycle rupture