Abstract: In order to study synchronous breakage instability mechanism of the key stratum group in the deep shallow buried coal seam mining, taking Wangjiata Coal Mine as research background, combined with the mining pressure and strata control related theory, numerical simulation software UDEC is used to simulate the situation of single key stratum and double key stratum structure in the overburden of coal seam. The measured data verified synchronization rupture instability theory. Results show that when there are double key stratum which is nigh distance and lithology similar in the overburden of coal seam, it obeys the key stratum of synchronous fracture criterion, its stability of whole structure can be regarded as a single key stratum structure analysis and the influence of rock pressure and strata control is consistent with a single key stratum.