Abstract：The distribution laws of stress fields in the course of mine tunnel excavation are simulated by means of FLAC2D software. According to the stress values and the coupling laws between electromagnetic emission(EME) and stress fields during the deformation and fracture of coal or rock，the changing laws of EME during mine tunnel excavation are also researched. The researching results show that the electromagnetic emission signals have the biggest value in the middle of tunnel. The monitored EME values are very varied under different loading stresses. The higher the loading stress is，the stronger the EME signal produced is. The EME values received in the detecting place will decrease in line with power rate relation with the increasing of EME frequency. And it is feasible to regard the stress concentrating area as EME resources. The EME in the same monitoring place increases firstly，and then increases slightly with the increase of time. The changing of EME strength reflects the changing of inner stress after excavation. The experimental results of EME have the same changing tendency as the simulated results，which also testify the feasibility of the coupling method between EME and stress. Thus it is offered a kind of new research approach to electromagnetic emission monitoring technology for the purpose of the application of monitoring EME in the prediction of catastrophe dynamic phenomena such as coal or rock outbursts.
