Abstract：First the distribution laws of stress fields in the course of mine tunnel excavation are simulated by means of FLAC3D software. Then，according to the coupling equation between electromagnetic emission(EME) and stress fields during the deformation and fracture of coal or rock，the temporal-spatial distribution laws of EME during mine tunnel excavation are also researched. The results show that the changing rules of simulated stress are in accordance with theoretical ones and practical strata stresses，which shows that the FLAC3D can appropriately simulate the changing rules of stress field in the course of mine tunnel excavation. The spatial distribution laws of EME are that the EME signals have smaller values when being monitored in the roof of tunnel than those in the middle of tunnel along the height of tunnel，and the EME signals have smaller values when being monitored in the left side or right side of tunnel than those in the middle of tunnel along the horizontal direction of tunnel. The EME signal in head-on area along the way of tunnel excavation increases constantly to the summit value，and then falls down. The temporal distribution laws of EME are that EME in the same monitoring place increases firstly，and then increases slightly with time. The change of EME strength reflects the change of inner stress after excavation. The practically measured results of EME have the same changing tendency with the simulated results，which also testifies the feasibility of the coupling method between EME and stress to study the temporal- spatial distribution laws.
