We develop a fusion model of electromagnetic waves propagation in coal mine tunnels.We modify the ray model by the modal theory of dielectric waveguide.By this approach we decide how many rays are launched

as well as their angles of departure (AOD).According to the theory of geometrical optics

we prove the reflection law and the included angle law of the projection of the propagation path of a ray in a rectangular tunnel.On this basis

we deduce the arriving position

the reflection number and the traveling distance of a ray as functions of its AOD when the ray hits the cross section where the receiver is located.We decide whether a ray hits the receiver or not by the reception spheres.Finally

the theoretical model is validated by experimental measurements.