Abstract: In order to study the cause of the "delayed" dynamic disaster occured in the intake airway behind the gob of N2105 working face in a coal mine,analysis was firstly conducted on the causes of the "delayed" dynamic disaster in this face from the angle of mechanics,roof rock girder theory and geological structure,then the theoretical analysis results were verified by using FLAC3D numerical simulation software,and finally,a microseismic monitoring system was established and used as a control technology for the dynamic disaster in N2105 working face.The results indicated that the "delayed" dynamic disaster occured in the intake airway behind the gob of the working face was resulted from the interaction of the tectonic stress,the side abutment stress of coal pillar and the bearing stress behind the working face;using microseismic monitoring technology could realize three-dimensional,real-time and continuous monitoring and early-warning of the dynamic disasters,which provided some guidance and help for controlling the dynamic disasters in other coal mines.