Abstract: in order to study evolution mechanism and prevention measures of a delay-ype dynanmic disaster in rlly-mechanized top cal caving mining from side stress of coa pllarthe supot tress of coal minin face and complex roof stress aspects a theoretical analysis methnod iwas applied to an aysis on the evolution mechansm of delay- type dynanic disaster and a FLAC3 Dnumercal sirulaton software was aplid to sirulation verfcation of thecreical anlysis results he resuts showed that the high stress in stress increased zone in rean of the goaf was the factor of major power sources.The coal illalet improperly would be major cause tomake side support pressure overlied.The bump pressure occurred by the unstability and breaking of the complex roof would pass to the seam floor by transmission role of the prolective coal ia./n combination with numercalsimulato resuts and the ste practces.,ased on dynani: danger degree,the coal mining faceof stidly was divided into a bump appeared zone,a general bump danger zone and high bunp danger zone. With three dynanic disaster prevention and control measures of seam water injection.,pre-spliting blasting in th plot face end and coa pilla lage dianeter borehole pressure released .dynanmic disaser acident ocured in the coal mining fce was fectively reduced.