This study aims to investigate the dynamic stress field during the process of rock failure. Firstly

physical model experiments were conducted to obtain the results of acoustic emission (AE) in the laboratory. According to the measured results

an equation was established for describing characteristics of the rock mesoscale damage based on the energy dissipation theory. Then this equation was implemented to FLAC3D software by using the FISH language. The improved equation can not only automatically search rock units within the damage scope of AE

but also weaken mechanical parameters of meso units. Finally

the relatively true rock fracture dynamic stress field was successfully acquired. The calculated results of rock failure stress field showed good agreement with the experimental results

which verified the rationality of mesoscale damage characterisation method. Simultaneously

the obtained dynamic rock fracturing stress field can not only explain the damage causes from the point view of rock mechanics

but also can predict the location of next rock failure. However

this method still has some limitations

and it needs for further explorations.